I don't know. It's a bit of Coke vs. Pepsi and Mac vs. PC with me. I like and use both Coke and Pepsi or Mac and PC, but if offered a choice I prefer Pepsi over Coke and Mac over PC.

With Studio, it's a who nuther ball game. For the longest time, Studio just didn't offer the features that Poser had, so I never bothered. Now, I just don't care about Studio at all. I prefer Poser exclusively.

Newbies tend to like and prefer whatever software they learn first, so it wouldn't surprise me much to learn that Studio has pulled ahead of Poser in use, but I'd be stunned silly to learn that Studio outsells Poser.