waterfox? too many custom firefox versions
the debian one is iceweasel, theres one for arch... just a lot of weird crap like that... they really arent any better or worse, just different in very slight ways (like icons)
chrome vs chromium however is a big difference... if you hvae the option, always rock chromium on linux
its the open source version, so its got some of googles spy-hax taken out and it runs faster with a tad more security... really doesnt matter a lot, but you might as well just do chromium cause its probably in your repos
(sudo apt-get install chromium)