I use tens. There's a couple of reasons for this. First, the entire affiliation I have with Ernie Ball and Music Man is due entirely to John Petrucci. I don't know how I managed to be living so far under a rock as to never hearing of either Ernie Ball or Music Man before then, but I managed. So, that's why I started using Ernie Ball strings, and why I eventually ended up purchasing a Music Man JP7. Now, prior to me "discovering" Ernie Ball strings, I certainly went through quite a few other brands, and for the lack of a better term, they were of garbage quality. After a while, I noticed that sets of 10s were drastically less likely to have a broken high-e string while bending up a full step at the 22nd fret (I don't know why, but they always seemed to break when doing that specific bend). I've now been playing for about thirteen years, and my experimentation took place for many years in the beginning. Because I was so much more satisfied with the resilience of the 10s, I just got so used to them, and now that's all I truly like.