Very Meh... I liked the one Utah puts out a bit more.
The snow is usually better as well although Vail and Summit Co. have been getting some good dumps this year.
I've been to both. Both conferences have actually been pretty good general conferences with useful topics and excellent speakers. Vail vs Park City is personal preference. I'm not a huge Vail fan (although I'm headed there on Saturday); it's just so big to navigate. It takes forever to get where you want to go. Although, now that PC and Canyons have merged into a single mega-resort (also owned by Vail), it kind of has the same problem. From PC, however, you have Deer Valley right there (sorry snowboarders) and some super dope options 30-45 minutes away (Cottonwoods, even Snowbasin/PowMow). Hard to beat Snowbird on a powder day (if they'll let you up the canyon road). I also like Main Street Park City better than Vail/Lionshead Villages. A little less frou-frou, a little more cowboy. Again, personal preference. Hard to go wrong with either.
Other good ski conferences:
-University of British Columbia's conference at Whistler
-Emory and Thomas Jefferson both do a Big Sky conference
-SCA used to do a great CardioPulmonary Bypass conference (which they might be bringing back) at Whistler or Aspen
-UVM has a conference at Stowe
-If you want to step outside your comfort zone a bit, there are Wilderness Medicine conferences in Big Sky, Park City, Sun Valley (i've done this and the lectures are super cool!)
-Holiday Seminars in Snowmass
-Not that I am endorsing, but NWAS does conferences in Steamboat, Jackson, Tahoe, Vail, Telluride
-And if you really just want to write off a trip with basically zero educational value, your can do AEI Medical/Legal/Dental Seminars at Aspen, Vail, Beaver Creek, Keystone, Jackson, Steamboat, Breck, Telluride, Whistler, Tahoe, Big Sky and Park City every week of the year. You sign in, sit and watch videos on a monitor in an empty hotel room (or you just sign in and go skiing).