PC: Currently using Chrome Canary, thinking about using going to Firefox
Android: currently using
Lighting browser
I just use it because of the + and - numpad hotkeys that allow you to zoom in or out and immediately make the Flash embed smaller or bigger
According to this though, it's not that great:

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The same benchmark of where you stole that picture from. (had a ton of tabs open too!)
http://www.wgt.com/forums/t/167923.aspx
CLICK HERE for the flash test!