There were two Costcos in Tucson and they were more or less the same. The one closer to Marana was a newer, slightly nicer structure but the eating area (until recently) was outside, which only made sense about three months out of the year. The one on Grant Road had an awkward parking lot that somehow made it impossible to park anywhere near the entrance, but it was a slightly larger warehouse with older, more professional staff.
Still, though, both Costcos sold the same stuff. A good portion of that stuff was alcohol. I'm not kidding - a huge swath of the warehouse was given over entirely to wine. There were other aisles with vodka (including Kirkland Signature brand) and other spirits. Then there was a sizeable beer section over by the chips and crackers. I remember reading somewhere that Costcos tailor their merchandise to specific markets, which tells me that Tucsonians love their alcohol (not that there's anything wrong with that).
So as long as we're determining the preferences of a population based on what's in stock at Costco, I can tell you what Utah Valley shoppers enjoy in lou of alcohol: frozen treats, pop/non-alcoholic beverages, and children's clothing. I know for a fact that the American Fork Costco does not sell alcohol, at all. Jeremy and I went there and noticed that unlike in Tucson, half the warehouse wasn't taken up by wine, so we asked an employee if they sold any. "No, we don't sell alcohol," she told us ("Because we're righteous like that" was implied).
As someone who doesn't drink alcohol, I guess it's kind of nice to not have to wade through the aisles of spirits, and also to have more selection when it comes to popsicles and baby pajamas.
One final note: instead of adults going out to drink in Utah Valley, people take their whole families out to eat. Seriously, there are SO MANY restaurants here it's unbelievable. And they're all packed full of large families with children running around, at all hours of the day and night. On the one hand, it's great to see people engaged in such a wholesome activity. On the other hand, it means that going out to eat is not really a quiet, restful experience. But on the other hand, it also means that I can count on my kids never being the worst behaved. Excellent.