Serre Chevalier
The most complete family resort in the Southern Alps, and the clear pick.
Serre Chevalier links a chain of characterful old villages beneath a large, sunny mountain whose lower slopes are sheltered by some of the best tree skiing in France, which is a gift in poor weather. The terrain spreads from gentle nursery zones through endless intermediate cruising, so a mixed ability family never runs short, the ski schools are large and capable, and the old villages give evenings a real sense of place rather than a purpose built hush.
It takes top spot because it offers the most terrain, the best bad weather skiing and the most charm in one package. The trade is that it is spread along a valley, so choosing the right village base matters for keeping the youngest skiers close to the slopes.