I've been to both a few times and they are fine. I've seen Nebraska at SC and Creighton and Omaha at UCLA. I'd take Hawks field over bothI've never been to a game at USC, but UCLA's baseball facilities are nothing special. Aside from the Jackie Robinson statue, the stadium is kind of a dump.
Weather and strength-of-schedule will be a shocker, though. I'm sure neither baseball program is excited about the move.