I've been using the stock browser. Pinch-to-zoom doesn't seem that important to me, and the double tap zoom is great when browsing with one hand.
The pinch zoom on dolphin is okay, but I prefer the long press which brings up a semicircle that you can zoom from single handed. I also think dolphin is faster than stock. IMHO
I found myself bouncing to other web pages with the double tap and all the embedded links.