I agree with everything Northwind said. The trail down the the valley in Pila is just known as the freeride trail I think. Next time I go I won’t even bother with the stuff up the top (full of braking bumps) – I’ll just spend all day on the Freeride! 2 hrs from Les Arcs.
La Thuile is stunning. The singletrack is superb. Some great steep, rooty, dusty sections through gorgeous sun-filled forests. Probably my favourite place ever (apart from Granny’s Garden in Les Arcs). 1hr from Les Arcs.
Tignes is ok. It’s all man-made and bermy. Good that it’s free. I’ve not done Wonderboisse though which is apparently really good. Top tip – don’t break any bones. The lifties won’t let you get the chair down so you have to walk off the mountain. Trails are well maintained (I’ve seen guys out with spades every time I’ve been there).
I’ve heard Les Saisies has some MTB trails – anyone been?