Not trying to sound rude but this is stupid to vote on....
They are both very good at what they was made to do, 1 was made with speed in mind the other was made to be compatable with games.. Voting right now at the current state is pointless therefore i wont vote.. (sorry)
As already said, gcemu is not nearly as compliant as dolphin. Although dolphin is much slower then gcemu. Which kinda gives gcemu a leg up, since they will most likely fix the compatibilty over time, where as the dolphin team likes to keep reminding people that speed isn't possible on current computers. Which one is better is a matter of opinion though, do you want it to look pretty? Pick dolphin. You want it to run fast enough to do something? pick gcemu.
this thread is pointless. neither of them play games at full speed completely yet, and each one is ahead of the other in a certain category (speed or graphics). just test out a game and see which emulator you like better.