if it was anywhere in mid season, I would say yes, go for it. If it is at the very beginning or end of season, than maybe not.
This is a valid recommendation for the Park City group. Snow conditions in the Cottonwood Canyons have little in common other than being in the same state. Compared to any of the Park City resorts, Alta/Snowbird/Brighton/Solitude
1) Get at least 50% more snow
2) Ski terrain is on average 1,500 feet higher
3) Higher percent of north facing runs
This year I skied Deer Valley on March 31 and Snowbird on April 1 (no new snow either place) and it was like night and day.
When I have 4 days to ski, I want to spend my time skiing, not playing follow the leader single file on a small track for 15 minutes to go find "the goods". Get off the lift and go. I'll climb once or maybe twice a day, but mostly I just want to ski. So Alta is not very high on my personal list.
I personally like to have the choice. Snowbird has its fair share of "small track for 15 minutes to go find 'the goods'." For example Bookends, Tigertail, High Baldy and the Ho Chi Minh trail. The latter is every bit as obnoxious as the High T at Alta if you go way out to Tower 3, Lone Pine or Mach Schnell. These less accessible areas (and their counterparts at Alta) are desirable to have midday and later when there is new snow and the direct lines have been hammered.
That said with all conditions equal I do prefer Snowbird for being larger with more direct access skiing and more long fall lines. But if you go there regularly you learn that conditions are not always equal. Alta's most conspicuous advantage is in early season. The layout and higher base elevation make ~75% of Alta pleasantly skiable on a 3-4 foot base when Snowbird is still a minefield of rocks. Alta gets on average 10% more snow than Snowbird but there are individual storms where the difference is more, and in the early stages of a storm you might be floating at Alta while you would be hitting bottom next door.
The most interesting issue is crowding. The worst liftlines of my life were at Alta during Christmas week of 1986-87. After that experience I refused to ski Alta on weekends or holidays until the Collins high speed was built in 2004. Pre-Collins I would average ~50% more vertical skied per day at Snowbird vs. Alta, quantifying Michigander's opinion about A Lot of Traversing Around. Post Collins the gap narrowed to 20% or so. This past season I've observed in 13 days skiing, plus similar observations from the locals, that Snowbird is busier than Alta. It's most evident in parking and early morning tram lines, but in 2010-11 my vertical per day was now equal between Alta and Snowbird for the first time. So Snowbird has slightly longer lift lines now which offset the direct vs. required traverse skiing. This observation also makes me more likely to choose Alta (or better yet, the AltaBird pass) on big powder days than I have done in the past.
Every time I've been to Utah to ski for several days- I've never once skied in more than 6" fresh snow.
Snowfall is extremely volatile. In my first 100+ days of Utah skiing over 20 seasons I averaged 55% of normal snowfall. So anecdotal experience from a handful of 4-7 day destination trips is nearly useless in drawing conclusions. Fortunately the past 3 seasons I've been catching up on that previously sorry track record. And I should mention that Snowbird was my favorite ski area during those 20 years even with minimal powder.