depends where you live, here in Australia, we have a plethora of good cheap after maket efi computers, wolf 3d, mircotech, haltech, and also not so cheap, autronic and ofcourse motec, in all ways efi is better, its just weather you can find something suitable for your application, that you can afford. here you can get throttle bodies alot like weber side draughts, with injector mounts built in, and theres also a place here that makes flat slides for 4ag's, it depends who's building the car too, some guys have been working with carbs for a long time, and thats just what theyre comfortable with, peak power if set up correctly will be similar, but torque and driveability will always be better with efi.