I jump among Safari, Atomic and Terra.
I also bought iCab, but I didn't find anything helpful for my uses, and I kept getting a pop-up that indicated a Trojan, though I figured it was bogus. I deleted iCab because I couldn't get pass the Trojan pop-up. It stuck even after I deleted and reinstalled. I found that too annoying to bother with further.
I'd use Atomic more if it didn't hang sometimes and didn't open some pages (pages that Safari has no problem opening). I prefer the tabs that Atomic and Terra offer, but for me the real seller is Atomic's brightness feature, which allows brightness much lower than iPad does.