For those who voted Ultimate, may I ask why?
Aside from the reasons people mentioned, like all the teenage drama and angst...which I personally didn't mind, the book was overall boring. I guess there was an overall mandate in the Ultimate Universe for everything to be more "realistic" and "grounded" due to the success of the X-Men films, which severely limited the storytelling.
There was also just killing and violence for what seemed like shock factor as opposed to anything else. There is other reasons I could think of.
To be honest, I actually enjoyed the Ultimate X-Men when I first read it, I remember reading it when they were coming out and it was a great companion to the X-Men film and X-Men Evolution, all three of which dealt with more of a pragmatic take on the X-Men. Just now, when I look back at it, it is something that was only good for its time, which was the year 2000, and just doesn't feel like it aged well.