I'd say go with the kickers just because my friend had a pair of Pioneer subs and they just seemed to always be lacking, there was just something that held me back from liking them, Kicker makes good products, i'm very happy with my Kicker L5;'s
Well, you will be moving more air because you have twice the surface area, i also doubt that sony amp actually puts out 1200 watts...it'll put that out for about 1/100th of a second right before it sets on fire...your kicker products will run nicely for you, if its brand new, dont try to run it real loud for the first few weeks, give the subs time to break in
oh yah one more thing how would u suggest wiring this amp i really dont know much about this but do u kno wo fany diagrams of setting up an amp and 2 subs in my car i just bought a 4 gauge speaker installation kit with fuses and everyything so i should have all the pieces?