I see a lot of similarities between Safari, Mozilla Firefox and Camino. All three are lean, mean browsing (and ONLY browsing) machines -- like Opera used to be back in the day (Saturday I think
). All three have user configurable toolbars with drag and drop ability, all three have separate Location and Search boxes (unlike the full Mozilla which can search directly from the Location box), and all three are available in native form on MacOS X.
There's simply no doubt, though, that Safari is far and away the most "Mac-like" of the tree; Apple knows a good thing and has done good work at making this Konquerer/KHTML based browser a native part of OSX. Camino is next in line, having a totally native user interface with some very nice looking widgets and stuff. Firefox is the most cross-platform and works (at least 97%) identically on Mac, Windows, Linux, OS/2, etc. It's the least "Mac like" but it's still a great browser, with the same rendering engine as Camino, and if you do use multiple platforms then you may appreciate how FireFox looks and works the same on all your systems. Consistency can be a good thing.
Personally, I use all three on MacOS X. I've had some issues with Firefox not recognizing right mouse clicks (ever!), I have Camino set as my default web browser, but I don't see any particular advantages that Camino has over Safari or vise versa, other than Safari's damned brushed-metal look.
I greatly look forward to the official Firefox 1.0 (the current release is the 1.0 preview, aka beta) and hope that it will start working with my right mouse button (Camino and Safari both do).