I can't pick a single option because I usually use three browsers at the same time (for different purposes)(the joys of being a webdev).
Also, all browsers are fine in my book as long as they're not Netscape 4: I still shivers when I think of this Cthulhu'an horror, I mean c'mon, that.. thing.. reloaded the whole page when you resized the window
Kids nowadays should spend the day with Netscape 4 before they have the right to make [rightful] fun of IE6 (yes, destroying innocent minds is a fun hobby when I'm not scheming to rule the world).