I primarily use Firefox(Every now and then I call it Fox Fire by accident[too much Inu Yasha]). Also Google Chrome when something doesn't pull up properly.
Internet Explorer reminds me of Slowpoke(from Pokemon). Takes 5+ hours to do something.
Those 3 browsers have the best support of HTML5 potential standards. I mainly use Chrome because Maxthon tends to be less stable than Canary, and Opera can't update at work(it is hosted on a proxy server).
Mozilla Firefox is the best imo. Chrome doesn't have a reset function so if you download something that screws you home page or new tabs, your pretty much screwed.