Done a few trips away and they’ve all varied in terms of riding and overall holiday experience.
It’s quite difficult to recommend something for you as the most obvious destination for you in terms of accessing trails without working for them would be Morzine. Problem then is that IME it’s definately more suited to DH than trail centre style XC. Overall, compared to other regions that I’ve been to in the alps, the trails that I rode in Morzine were overused, overworn and generlly rather dull.
The Tarentaise valley has far more buff alpine singletrack with a large lift network so could be an option for you if you don’t like pedalling.
Verbier has pedal free options too but IME it’s definately a few notches above UK trail centre standard in terms of steepness, techiness and general pant wetting scaryness.
In summary and based on my own experiences – in terms of testing yourselves and seeing what the alps can really be like then go to Verbier. If you want to have about as much fun on a pushbike as you can possibly have, then go to the Tarentaise (Sainte Foy, Les Arcs etc) . If you want to be in a town full of Brits and enjoy the apres as much as the riding, go to Morzine.