I would try chrome if there was a mac version;
I would use Safari or Opera if they represented a larger share of the market;
I would use Camio if it supported FF add-ons (it might do this now but it did not when I tried it out);
I may very remotely consider IE if there was a mac version (I just hate IE and M$ so much because of their total disregard for the web and standards that I doubt I will ever endorse them for anything, IMO seems like a huge step backwards);
That only leaves FF. It is not my favorite, but seems to be the most common denominator for mac users. I find it clunky and there is definitely a memory problem someplace if you get too many tabs.
I want to install Ubuntu (or some other *nix OS) on an old G3 i have stashed, but have not found the time (or the space on my table top). Maybe next year.