Aero, reason being- they are far more efficicent imo. Check out my most recent box build for an example of how a true aero box should be built (special piece inside the box)
The end result was 142.5 sealed on the dash out of the trunk on 1.4k before rise, stock electrical, no deadening on some 6yr old sq subs, oh and the box was tuned to 31.75hz. What I'm saying is there is plenty of room for improvement and I'm already close to what other people doing with more power and higher tuning with stronger equipment.