Its relative...everything is except life and death. For me L7's are a much better woofer cause they DO play low and dang loud too. You are making a living off box design? My box isn't typical to "kicker" recommendations. Right now I want it loud as possible for my daily, the R's can't compete with them. Don't get me wrong though, I installed an R in my friends car and the lows hit deep and smooth, its a little sloppy on higher notes do to the overall box volume, thats why I am making a new enclosure in a few days. But the R does sound better as far as sq is concerned.
If I wanted a decently loud sub that sounded awesome and didn't wan't to spend a gagillion dollars I would definatly run R's. However, for what I am looking for in MY subs based on output levels and the type of music I listen to, the L7's are better for me.
Moral.....listen to them (in an actual install) and pick what you like.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif