its only been an hour man calm your ponies. my opinion the L7....but not sealed.....these subs sound like garbage in a sealed enclosure.....port it for the full potential
But I haven't heard either sub yet so sorry but I heard the L7 is what people usually use for SPL only. I owned a few Audiobahns before and they were ALL SPL.
If you want SPL then you don't want a sealed box, you'll have to go ported. As for being louder L7's are louder then L5's... as long as they are in a ported box. I can't say which will be louder in a sealed box if you still plan on doing sealed... going sealed and going for SPL really don't mix.