Mix bus compression or individual voice compression?
So much depends on the room, the mics and, above all, the "talent" as the americans call it. And obviously the settings on the comp. I find that compressing vocals sometimes create other problems, which is perfectly natural. I'm thinking about sibilance, noise rushups etc. That's why I've always preferred some sort of strip solution to just a comp. That bieng said, you can get a full sound with just a comp too, but if I were you I'd read a book on audio mixing and learn how it works so I can work it out myself. Holistic learning is the only kind that works.