I don't really care about SPL. I'm more interested in sound quality, and the 13W7 is superior in that regard. The JL is a faster sub, in part due to the smaller diameter and lower driver mass. power handling means little, by the way. Look at audiobahn subs. They claim to handle something like 5000 watts, but that doesn't mean they're all that loud, or that they sound very good.
What's the one-way Xmax on that RF anyway? I'm curious.