KICKERS are DIRTY, DIRTY, DIRTY. I personally hate them, the sound quality on an alpine is far superior. However, if you like a lot of bass (regardless of quality) then i would have to say to get the KICKERS. "Most" 10inch subs, even an alpine type-R, will have trouble trying to compete with two 12s, no matter what brand they are.
I had two 12" Type-R's, and I hated them... the sound was far from clean, and weren't very impressive. I have never personally had any experience with Kickers, but I know people that have them and are happy with them...
Just make sure your box compliments your subs (you can call the manufacturer and find out if the subs are meant to be paired with a ported or sealed box, air space, etc...) The box DEFINITELY compliments the sub... just remember that
The kickers. they will be louder. If it was the size of the kicker and the same quantity the i would choose ethe alpine but the kickers are better than one alpine.