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This guy is a f***** joke. I have heard both and think that you couldn't go wrong with either one. Both has it's pros and cons. Although not cheap the Memphis is a little cheaper than the JL but from what I have noticed it needs alot of juice to have peak performance. Also you will have to wire your subs at 1 ohm to get the full 1000 watts mono.
The JL will put out full power from 1.5 to 4 ohms with just 11 volts, at least that is what they are suppose to do....
All I can say is choose the one that works best for you budget and set-up.