Should i go with the JBL 1400 watt amp or the Fosgate 1000 watt amp?

ok so i have a 2005 ford f-150 cab n a half with a custom built box that the best box builder i know made for me hes the only person i knew that fit 12's under my back seats even places like audio express tryed 2 say i could only fit 10's but he did it he fit two 12" infinity kappas i only bought a cheap 700 watt soundstream amp but it still slaps pretty hard but i wanna upgrade to that ear hurting oustanding b where other people outside are like damn and that makes my truck flex like crazy should i go with the bestbuy 1000 watt rockford or the jbl 1400 watt thnx i really appreciate the help...p.s box is not ported and amp is behind my backseats