As far as performance goes they are pretty equal, however they all get there in different ways. I've ridden DA and Record (have Record on all my bikes). From a performance standpoint they are virtually equal. However ergonomically the Campag hoods fit my hands better so I chose to go that route.

This question is much like 'who makes the best saddle' well the best saddle (or any bike component) is the one that works best for you.

The bottom line is that each one of these gruppo's has some pluses and minuses but in the end they all work very well. So pick the one that fits your body and riding demands the best.