I've been to Cerro Catedral/Bariloche(Argentina) and Valle Nevado(Chile) and can recommend both.
there is an international airport in Bariloche so getting there won;t be too tough. If exchange rate is still good(was 3.5 to 1), it;s a tremendous value-you can spend and eat like a king. Steak and leather goods are their best values. the town is 45 minutes away from the ski slopes and the town has lots of restaurants and a casino. you take commuter bus to the ski slopes every morning(ala Jackson Hole). since it;s off a lake, resembles Lake Tahoe in my opinion. as for the terrain, I thought it was pretty decent, not the most challenging but large enough to be interesting for a week. lots of old lifts though but a couple of high speed quads. not the highest altitude but since we got snow before we got there(an avalanche took out a mid mountain lodge!) we had a weird wind blowing that automatically "groomed" the snow in the upper parts of the mountain giving us the appearance of fresh tracks on one side of the mountain face and wind scoured hardpack on the other.
at Valle Nevado, it was an all inclusive resort so food was included. sort of like a cruise ship it;s buffet food, you could pay more to eat in the separate sitdown restaurants. Terrain was not difficult and went in the equivalent to our march so we got sort of springish conditions and no new snow so it colors my review somewhat. fairly large too-there are 2 other smaller resorts you can trek into for extra cost. Chilean money worth more than Argentina money though so not as good a deal. higher altitude-about 10,000 feet so stay hydrated. lifts were old too. trip to the mountain was wild-25 people crammed into Airport shuttle buses with ski gear on roof going up switchbacks(not circling the mountain).
Haven;t been to las Lenas yet. reputation is to be the biggest and baddest mountain in the southern hemisphere and maybe the world. but before you book, need to observe the weather and lift reports closely. the notorious Marte lift is a fragile lift prone to wind hold, break downs and generally not running. was observing ski reports last year and for some reason Cerro Catedral had a banner snow year but Las Lenas not so much. Your mileage may vary....