So I've recently migrated from the boxer brief world to the trunk world. And just as much switch from boxers to boxer briefs was life altering, so too has been the shift from boxer briefs to trunks. I'm never going back. For the purposes of finding out which trunks fit best, I ordered pairs of the Calvin Klein One Low Rise Trunk, the Calvin Klein Steel Micro Low Rise Trunk, the Calvin Klein Body Modal Trunk, and last but not least, the David Archy Micro Air Modal Low Rise Trunk. This review is a cross-comparison of all four types (for those who are comparing or who might find this useful, I ordered a medium size in all of them, and am 5'10 and about 150 with a 31 waist).
So what are my findings (of course, your opinion may differ). The most comfortable by far for every day use, were the modal underwear by Calvin Klein and David Archy. Though the Calvin Klein pair fit me slightly better, and seemed slightly more comfortable (and I mean slightly, on a 100 point scale, maybe a few percentage points), for all intents and purposes there wasn't much difference. Both pairs were extremely soft and form fitting against the legs, but had enough of a pouch to keep things in place, but not feel overly constricting. These pairs were perfect for everyday wear. Given that you can get 4 of the David Archy pairs for what it costs to get 1 of the Calvin Klein pairs, there's no comparison - David Archy Micro Modal Air Modal wins with no contest.
So what about the other pairs I tried? The Calvin Klein Steel pair was actually pretty great as well, but not best for everyday use. I found this pair to be much tighter generally - the fit around the waist was more restrictive, and the pouch was much less pronounced leading to a much tighter fit. That being said, if you have a night of vigorous dancing planned, this pair of underwear will be sure to keep everything securely in place (which I think is desirable in such scenarios), but you may not prefer such a tight hold. I should add that in terms of sheer aesthetics, this pair has the most... visually appealing look.
Lastly, the Calvin Klein One seemed a bit too constricting. More appropriate, perhaps, for someone who wants to wear trunks while exercising? The bands around the thighs were much tighter than the modal models, and thus were not nearly as comfortable for everyday use, but perhaps could be a better choice if you wanted to wear trunks while performing moderately athletic activities? Honestly I don't know, I wasn't a huge fan of those.