i would say the kickers. but remember with either of those subs they'll both be spl subs and aren't going to have much, if any, sound quality. just depends on how you want your system to sound.
also, from what i've heard, from a friend and a kicker dealer, due to the solobarics being square they don't hold up as well as round subs. some would disagree but this is what i've been told.