I try to look at guitars as tools. If you can, you should have one each trem and non-trem. If you know what you want to play on it, then you've pretty much narrowed it down. If you don't, I'd get a trem and maybe a tremel-no and block it when you didn't need it. My main 7 has a trem, as all of my non-hollow body main rock guitars do. I don't go nuts on the trem with divebombs though, as they don't really fit what I play too often. So, I guess if you can only have one I'd say get a good trem and something to block it when you don't need it.