I always prefer two over one, for several reasons. If either has equipment failure issues, the other is there to play with. If the guy is socially awkward in person, the other is there to converse with. If one guys is not as good in the bed, I have another shot at a guy who can make me climax. If one guy flakes or can't make it, there's a backup. And it's hotter for me when two guys are tagteaming me and spitroasting me, they get in the zone and I let go and just enjoy the raw sex of it.