There's lots of good places really. My personal experiences are the following:
France is decent, the resorts are generally at a high altitude so you're pretty sure of snow even when booking months (or in my case, half a year) in advance. This is somewhat offset by the fact that the general attitude of the locals are very arrogant and unhelpful. As in, it's clear that they understand you, but because you do not speak french they don't even try to help you - even the ones hired in service jobs! Not to mention the beer.. oh gods, some of my worst nightmares are about the beer, thin, tasteless (if you're lucky, it's that or foul taste) and bloody expensive.
Val Thorens has a reputation of being THE party place though, avoid in highschool vacation weeks, the slopes are full of shitty riders and skiers, drunk as lords and the powder has been destroyed. But in other weeks are blessed with a big area with wonderful slopes and plenty of powder.
Avoriaz is my favorite, big area so lots of room. Relatively few drunk high schoolers on the slopes and the town itself is really nice (no cars in the town, all taxi's are horse sledges!)
If you value your time, avoid Le Deuz alpes for all cost - slopes are only groomed every second day, lots and lots of flat transport areas, and when going back to the town when the day is over you can only get black mogul runs (groomed every second day + only passage down to the town...) or green transport filled with people.
I've heard a lot of good things about Austria. Great beer, nice people, all perfect. The downside is that the mountains are fairly low altitude, so you're not sure of the quality of the snow.