Nick is my favorite, but I think I usually end up reading group stories the most.
If the characters are interesting, it could be either.... But it is BSB fanfic for a reason. So, I like reading about the group the most, I think.
I think I like old school Backstreet more, just because they were all there, and from what we could tell, they were as overly dramatic as they are now. I mean, I know that they had their problems back then and all, but it seems like a happier time back then.
Maybe Howie? Sorry Howie.... You're usually either awesome or boring. When you're awesome, great! When you're boring... Well, I don't like reading about any lead that's necessarily boring.