Actually they're pretty darn close. But since you're making me choose... I guess for the street I would choose the 72's to keep the idle a tad cleaner. Other than that, they both run well.
I've actually been running around with the 120's in the car recently, stock ECM with Bob's driver mod. They ran real well considering their size. Just took them out to run the high-z 79's, which also run great so far.