You have Chrome, Firefox, Opera, Explorer and Safari freely installed. You want to Google which one is best. You don't know which browser to use for that; so you post up here for us to tell you how to live your life.
You, sir, are experiencing a First-World problem...
Internet Explorer Chrome Opera Seamonkey Konquerer Epiphiny iCab Omniweb Camino Safari Netscape Navigator
quite a mac centric list. And by what criterion did you include a browser or not? You do have some unknowns like Omniweb in there, but you left out classics such a lynx or various somewhat know gecko browsers such as K.meleon or iceweasel.