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JL Audio 500/1... Which 12" sub?.. Rockford Fosgate P3, Alpine Type R, or MA Audio XL?? - alpine xl travel trailer

I use only a JL Audio 500 / 1 amp. I also use a 1 farad capacitor and Fosgate 4 AWG. Wire. My intentions are to use one of 12 subgroups. 'm very open. Of course, I want 12 to 500 RMS. That's where I am W / any kind of decision. Rockford Fosgate P3, MA Audio XL or Alpine R. I am open to all councils, new options in the same category, and explain why you offer your opinion. Thank you!