Well it kind of depends on what your're looking for. Lam paper is lighter, but that doesn't mean it will be more efficient. Paper is more suceptible to UV light damage and also moisture damage, although the laminate helps some. Polyprop is stronger, lasts much longer, and is not affected by moisture or the sun. But if you want the best-of-the-best, go with aluminum or titanium. I have 2 15" Eclipse aluminum cone subs, and they are nearly indestructable! They also act as a heat sink for the voice coils, so its very difficult to blow one of these subs. They are more pricey though. Go with poly.

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)