I use both GameTZ and Goozex. Both have their strengths and weaknesses, but I prefer and vote for GameTZ. I think it has more of a community feel. (I think the majority of GameTZ users actually participate in the forums -- while the majority of Goozex users probably never enter the forums at all.)
Plus, now and then, I want more obscure titles or games for systems that Goozex doesn't even support -- so Goozex isn't even an option. Also, I'm sometimes a little slow to decide what I want. If I'm slow on GameTZ, it doesn't make much of a difference because I can just make a better offer to get what I want quickly. But if I'm slow on Goozex, I end up behind dozens of other people and may wait weeks or months to get what I want. Goozex is a bit too much "you snooze, you lose" for me. (Which explains why I have tons of points, but few filled requests these days.)
So, again, GameTZ for me!
- John...