I will rate mozilla firefox as the best one.. Next come the google chrome. These days internet explorer sucks..
Firefox was the best, now I would say Chrome is alittle better. Its fast and you can install adblock/firebug on it. What else do you need.
Firefox for me, not so much whether it is the best... but I've been using it for years and cannot drive myself to use Chrome.
I use Safari with the Glims plugin on my Mac. Other than that, Chrome for speed and Firefox for customization.
Mozilla Firefox and Google Chrome would be the best for me too. I have used Google Chrome before, but it can't download the Search Status for me to see the do follow and no follow links so I use the Mozilla Firefox again. After all, I was still satisfied on it although it crashes sometimes.