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Safari is faster than FF on my 24" iMac, and since I found the Inquisitor Plugin I never opened Firefox again :)

And with Safari Enhancer you can import your bookmarks from FF.

IMO Safari is the best, fastest, stable OSX browser. I only use FF or Camino when I really need to.
 
Safari seems slow to me and the Gecko engine used in Firefox renders pages better. However, many of firefox's elements aren't native OS X code. I use a combination Safari, Firefox, and Camino. But right now I like Camino the most because it combines native cocoa with the gecko rendering engine. :)
 
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