Started with ST2, tried Atom, Brackets, Adobe's Edge Code, and WebStorm. Now I'm back to ST3.
Atom wasn't finished enough for me and didn't have the package numbers to keep me
Brackets is cool, but didn't have enough customization/features I was use to with ST
Edge Code is ok if you're an Adobe nut, and it has some Brackets features built into it I believe
WebStorm is probably the best IDE I've used, but at the same time it was almost too much. I found the extra steps slowed down my dev time. Although maybe if I had used it longer I would get use to it. It also took forever to index on a new Macbook Pro, and blocked me from editing for a few mins every time it indexed (pretty often). Might be able to fix that by blacklisting some of the files that don't need to be indexed every time?
ST3 is perfect for me; speed, every package you need, great distraction-free UI, few bugs, extremely customizable, etc.