chrome has a superfast java interpreter
chrome has a good API for extensions, even though not many extensions have been made so far, so when it comes to actual downloadable extensions firefox wins
chrome has a much smaller interface and gets all the stuff you really need on a very small interface. So the interface is a matter of taste.
I'm all for chrome because I:
- want speed
- don't need a huge gui to take up half my screen
- don't need a shitload of plugins
If you don't agree with any of those 3 points, you better stick to FF. Otherwise, chrome all the way.