It's all down to personal choice really, and there's no 'best' browser, though some are clearly more popular than others (Opera is down at about 2.5%, Chrome a little above it, Firefox above that and various versions of MS Internet Explorer total more than Firefox).
Not sure where Safari comes - I don't like it that much, but mostly because I've used Netscape {and now Firefox} for over 14 years (I have Netscape 7.2, 7.1 and some earlier versions on different PCs, plus Opera and Firefox. I have Opera 9, Opera 10, Firefox 2, 3, 3.5, and copies of MS IE v6, v7, v8 and Chrome, but rarely use MS IE or Chrome).
I brought back a copy of Netscape Gold v3 in 1995 from the USA (ignoring the export restriction!) and had previously used v2 and v1 (which came on floppies from my USA ISP called UltraNet, back in the early 90s).
Latest version of Opera (v10) has a neat synchronisation facility so bookmarks and notes get copied to every PC I'm using, wherever I added/ changed the entries.
There was an add-on for Firefox which did similar (called FoxMarks but now changed name to XMarks, I think, to include some other browsers).