For me, I prefer Safari. I love the ability to sync bookmarks across Macs AND my iPad and iPhone.
I don't notice a big speed difference between Safari and Chrome. Firefox seems much slower.
+1.
I was using chrome since it was released, both on my previous mac and windows laptops. But with OSX Lion, safari is a much better choice.
Chrome actually has the 2-finger swipe to go back/forward, but not with the same animation as safari, which makes it better. And safari is as fast as chrome now I believe.
But chrome is always a must-install app, for incognito browsing, if you get what I mean ;-)