Go to Tenerife. It has the most flights from the most UK and Irish airports, the widest range of places to stay at every price, the best public transport, and enough variety — beaches, a 3,715-metre volcano, two proper towns, the best theme park in Europe — that a first week can be almost anything you want it to be. If you have never been to the Canaries and you want a straightforward answer, that is it.

The runners-up are Gran Canaria, which is the better choice if you want a city as well as a beach, and Lanzarote, which is the better choice if you want somewhere calmer and stranger to look at. Fuerteventura wins on sand alone. The western islands — La Palma, La Gomera, El Hierro — are wonderful and are the wrong place to start.

What follows is why, and the specific cases where the recommendation flips. Because the honest truth about a first visit is that the mistakes people make are rarely about picking the wrong island. They are about picking the wrong side of the right one.

Why Tenerife, specifically

Tenerife is the largest island and the most developed, and for a first trip those are advantages rather than criticisms. Flights land from most regional UK airports several times a week and often daily, which keeps fares sensible and gives you options if something goes wrong. Accommodation runs from €40 apartments to five-star adults-only hotels within the same few kilometres. Buses genuinely work. English is widely spoken in the resorts.

More importantly, the island contains several completely different holidays. The south-west around Costa Adeje and Los Cristianos is the polished resort coast, with the reliable sunshine and the big hotels. The north around Puerto de la Cruz is greener, older and considerably more Spanish, with a botanical garden and a seafront lido instead of a beach strip. In between sits Teide, and a day in that crater is the thing most first-timers go home talking about.

Add Siam Park, which has topped global water-park rankings repeatedly, whale watching that runs year-round off the west coast, and a capital with a carnival second only to Rio's, and there is no realistic way to be stuck for something to do.

The mistake almost every first-timer makes

Tenerife has two airports at opposite ends of the island, and they are in different climates.

Tenerife South (TFS) sits on the dry, sunny southern coast, twenty minutes from the resorts most package holidays use. Tenerife North (TFN), near La Laguna, sits at 630 metres on the green side, where the trade winds pile cloud against the mountains — it is frequently overcast when the south is in full sun, and it is around an hour and fifteen minutes' drive from Costa Adeje, more in traffic.

People book the cheaper flight without checking which one it is, then pay €90 for a transfer across the island, or arrive at midnight with the last bus gone. Others book a northern hotel expecting southern weather and spend the week under cloud. Neither airport is wrong; they serve different halves of a mountainous island. Just know which one your flight uses before you book the hotel, and read how the transfers work from the south airport if that is where you land.

The north/south split applies to every big Canary Island and it is the single most useful thing a first-timer can understand. North-facing coasts are greener, cloudier and more Spanish; south- facing coasts are drier, sunnier and more touristy. Neither is better — but they are not interchangeable, and the difference on a given afternoon can be full sun against solid grey.

Gran Canaria — the strongest alternative

Choose Gran Canaria over Tenerife if you want a city in the mix. Las Palmas is a real working capital of 380,000 people with a three-kilometre beach, an old quarter of cobbled streets and a restaurant scene that has nothing to do with tourism — a combination no other island offers. The south around Maspalomas and Playa del Inglés has the same package infrastructure as Tenerife's south plus a genuinely extraordinary field of sand dunes behind the beach.

The interior is mountainous and beautiful, the bus network is the best in the archipelago, and the island is often slightly cheaper than Tenerife. What it lacks is a single headline attraction on the scale of Teide. If you are weighing the two directly, the head-to-head comparison goes through it properly.

Lanzarote — for a calmer first visit

Lanzarote is the thinking person's first island. It is smaller, quieter and visually unlike anywhere else: a black volcanic landscape with white villages, no billboards and strict building rules, shaped by the artist César Manrique into something that feels curated. Timanfaya, where the ground is hot enough centimetres down to cook over, is a genuinely memorable morning.

It is the right first choice for couples, older travellers and anyone whose heart sinks at the words "resort strip". It is the wrong one if you want lively evenings or a huge choice of excursions, and the beaches, while good, are smaller than Fuerteventura's.

Fuerteventura — if the beach is the whole point

Nowhere else in the Canaries has sand like this: enormous pale beaches, dunes behind Corralejo in the north and a fifty-kilometre run of them down the Jandía peninsula in the south. If your definition of a good holiday is a beach, a book and a restaurant, Fuerteventura does it better and usually cheaper than anywhere else here.

The trade-offs are real. It is windy — that is why the windsurfers come — and there is comparatively little to see inland. A first-timer who wants variety will exhaust the island in a week. A first-timer who wants sand will not want to leave.

Why not one of the western islands?

La Palma, La Gomera and El Hierro are the best islands in the archipelago for a certain kind of traveller, and they are all poor first choices. There are few or no direct flights, so getting there from the UK usually means a connection and most of a day in each direction. Accommodation is rural houses and small apartments rather than hotels. A hire car is close to compulsory. There are few beaches, little nightlife and no infrastructure for a wet afternoon.

Go to them on your second or third visit, when you know what Canarian travel involves and you have decided you want less of it rather than more. Then they will be revelatory instead of bewildering, and the case for the best of them is set out in our verdict on La Palma.

When the answer changes

If you are…PickBecause
A family with young childrenTenerifeWater parks, calm beaches, short transfers, everything open
A couple wanting quietLanzaroteLow-rise, scenic, unhurried
Beach-focused, watching the budgetFuerteventuraBest sand, lowest prices
Wanting a city and cultureGran CanariaLas Palmas is a proper capital
Travelling in December or JanuaryFuerteventura or Gran Canaria southReliably the warmest and driest
Going without a hire carTenerife or Gran CanariaOnly islands with dense bus networks
Coming mainly to walkTenerife, then La Palma next timeTeide and Anaga without sacrificing everything else

Practical things worth knowing before the first trip

The bottom line

Tenerife for a first Canary Islands holiday, based in the south-west if you want reliable sun and in the north if you want somewhere more Spanish. Gran Canaria if a city matters, Lanzarote if quiet matters, Fuerteventura if sand matters. Any of the four will give you a good week; the difference is in the details of what you want from it, and the full island-by-island comparison takes it further if you want to argue with the recommendation. What almost nobody does is come once — which is why the second trip is the one where you start looking west.