its my opinion that a well sorted EFI setup will almost always outperform a carby setup, as well as being far more versatile and less tempremental.
EFI can adjust itself to get the perfect air/fuel ratio for different conditions..
a carby car cannot. eg. if it is tuned to run at its best on a hot summers day, then it wont be tuned properly for cold nights etc.
i guess a pro would have to be its simplicity though.