The milk taste-off was really quite interesting, I'd never done a comparative tasting of milk -- thanks for hosting, Mike!
We tried the milks several different ways -- straight cold, then tried some of the favorites both as cappuccinos and straight microfoamed.
Cold, we did a 2-by-2 shootout and voted for our favorite of each pairing by stacking our paper tasting cups. My favorites were Maple View (#1), Simple Truth (Kroger's organic brand), and Horizon. I didn't really like Homestead (seemed thin/watery to me, though IIRC some of the group liked its sweetness). The Whole Foods 365 was fine but didn't stand out to me.
We then tried the Whole Foods 365, Simple Truth, and Horizon as cappuccinos (I think that's the subset that we tried?). After the capps, we decided tasting with espresso added too many variables and went to just tasting microfoamed milk (all steamed milk applications were prepped by Mike).
The Simple Truth and Horizon are both ultra-pasturized with DHA added and I had to focus to taste the difference. Between the two, I preferred the Simple Truth capp but the Horizon as straight microfoam, though I think my capp preference was mostly due to small differences in how the shot came out.
Tasting side-by-side, I recall being able to easily differentiate the 365 from the other two, but couldn't easily express a
preference between the 365 and the other two.
We also briefly discussed milk pricing at the end -- IIRC, the two from local-ish creameries in glass bottles (Maple View and Homestead) are around $4/half gallon, the two ultra-pasturized (Horizon & Simple Truth) around $3/half gallon, and the Whole Foods 365 something like $3.50/
full gallon.
My personal takeaway with pricing info was that, if I drank a lot of milk (or you know .. if I owned a coffee shop like Mike

), the 365 is close enough in taste that it would be my go-to choice at almost half the price of the others, and maybe splurge occasionally on the fancier stuff. One side note: at home, we
don't drink much milk and we typically have been buying the Simple Truth half gallons. We've found that the ultra-pasturized milk stays fresh
much longer than 'regular' milks -- probably about twice as long?
Anyway I'm not usually a milk drink person and someone else's preferences may be totally different, but this was certainly an enlightening experience!