Right now most people are using either Firefox, Chrome, or Internet Explorer. Those 3 browsers have dominated the market for a while, and recent speed tests have shown that IE and Firefox are actually outperforming Chrome.
I know one thing I like about Chrome though is that it auto-updates itself behind the scenes so that I never have to fool around with downloading updates and installing them and hoping they work. The other thing I like about using Chrome is that it’s been pretty stable for me. I used to have problems with Firefox AND IE both crashing randomly and having all sorts of stability issues. Now I don’t have to worry about that.