Two Jl Audio f113's or one f 212

I'm curius as I am looking to buy a sub that i will not have to replace for years. i know they both would be awesome but as power and punch which would be the best. I'm still not sure if I need 2 f113's yet. I kinda thought if I really didn't need 2 I could sell 1 for close to what I paid. But if I get the f212 it will probably be the last sub I would need for a while. Any thoughts or opinions is greatly appreciated.