I am a big EFI fan and will never go back to a carb, at least on my current car.

I think people put to much stock in the "self tuning" aspect of it though. They will tune to whatever AFR they are programmed for, it doesn't mean that it is right for your engine. That is something that you or your tuner need to find that happy place. Then you need to make the adjustments so it hits those targets in all conditions.

It would be unfair to do a Dyno test and not have several hours of tune time for both systems. There is no slap it on and flog it system that is perfect out of the box.