I'd go 1 1508. I have 4 of them, and honestly I think they sound pretty **** good, and so have ever one that has listened to my car. Good and loud. 1v1 I would for SURE take a 1508. 1 re8 can't keep up IMOwell i gues the best answer for this is to try it myself...
but if it was one to one... 1 1508 vs 1 RE8.... for both SQ and SPL application, build quality and overall performance.. whats your pick?