Subs & Group Delay

Any opinions as to the value of this spec vs. distortion specs. At any given price it seems that you can choose to optimze one or the other - or maybe compromisse a bit on each. Even the pricey JL 113 can't touch the $600 SVS for distortion at 95db (anechoic), but it shows about half the group delay. I'll try to audition both, but in the meantime, any opinions on the relative merits of these measures would be appreciated.

Marty