I think safari is by far and away the best... camino is my back up. version .7 has major stability issues - if you try to do things in too rapid a succession (close windows, for example) it crashes every time. I'm going to dry .8 now.
While on most webpages this is very annoying, it does have a very distinct advantage. It allows for Styles, which other mac browsers do not.
For example, a pull down menu on a browser that uses aqua is always just a plain pull down menu... But on Firefox the links in it can be coded to highlight if they have not yet been visited etc... This is a capability possessed by other PC browsers, but not by other mac browsers.
it all depends on personal view. I personally wouldn't use anything but firefox. its more secure and scrolls faster than a crackhead runs from the cops.
Firefox and Camino both allow for a right click contextual menu "back" and "forward". This one little feature that I have been asking apple to include in safari really speeds up the whole process for me. Safari does not have it. If you have a multi-button mouse I would say use either firefox or camino.
I am not sure if Camino has all these extensions. But I think Camino renders the page slightly better. It seems slightly prettier to me overall. I like purty.