I've skied there pretty much my entire life as my parents own a place over there, I've also been to a lot of other Europeans resorts, mostly in France, but also Austria, Switzerland and Finland.
Les Arcs is the dopest. Plenty of backcountry options over there, from tree skiing to cliff jumping, plenty of spots, some more easily accessible than others. But since you have so many spots, even a week after the latest snowfall you can still shred the north and least exposed faces and catch some powder.
The resort is huge too, so even when there's no pow, just cruising and jibbing around on the natural features is mad fun, you could pretty much ski the trails for 2 days straight without skiing two times the same trail. The park is good too if that's your thing, but I never spent too much time here, since there is that entire mountain to shred.
Of course since it's pretty much home to me, my opinion might be biased. Also the pass is one of the most expensive in France, around 50€ a day. Depending on what you are looking for, some other French resorts are also a good option. For example Areches-Beaufort is a little gem of a resort that offers plenty of dope backcountry options, and is not too crowded, and much cheaper than the big resorts.
So it depends on what you are looking for, but you can't really go wrong with Les Arcs.