ups have a better range, Glock only has potential in close combat with the burst
usp-s is a nicer gun in my opinion, the fact it has good sound good range and nice controlability makes it the starter pistol for me.
USPs one shot someone in the head in pistol rounds. So in competitive the first round is always CT-sided. But of course it depends on how good the players are at aiming
It depends on the way you play. If you are good at headshots then you should play with usp for sure, otherwise just spam the glock
USP is a really good weapon, i prefer that against the glock. The glock is also a very good weapon, so it's hard to choose.
i like usp because it one taps from long distance