Honestly 9mm and .45 Ammo are pretty close in cost. You can buy either locally, or online from $10-$14 per (50) rounds. There are expensive versions of each everywhere too though!
The USP 45 is larger than the 9mm USP too. The grip is taller, and fatter
Whichever feels better to you I’d get that one. I personally love the USP 45 grip! I like .45 too so it was only all reassuring
If your looking for a newer model that’s used, the barrel hood should show light wear if any at all. And the grip texture should be sharp looking, and shinny in appearance.
Follow your date codes, any USP past 2005 is the latest model I believe, and has all the updates, and revisions and is identical to a 2018 version I “ Think”
It really doesn’t matter what year it is. Mine is a 2007, but looks like brand new. I bought my usp tactical 45 used just a few weeks ago.
If it has night sights, checking the year helps to get an idea how old the tritium is though.
The USP is about as good as it gets in my eyes, and a lot of other people agree. They seem to sell out all of the new USP’s pretty quickly, Then stock will re supply eventually for all of the retailers.