I prefer more group sex than actual swapping, so we go for same room. I like to be able to touch, feel, kiss my husband while I'm with someone else, too. I like to be able to see the pleasure he is giving and receiving as well as have him see mine. The exception to this is when we have been with someone(s) a few times and want to branch out. It does happen, and hubby in particular really enjoys hearing my playtime stories after the fact. I am much more visual than aural, though, so 9 times out of 10 I still prefer same room.
In a nutshell, it's a shared experience so we go with same room unless it is a repeat swing partner that we think would be interesting to approach differently.