Caveat: I'm totally biased.
Opinion: Cams.
Why? #1: With revshare programs like LiveJasmin (30%), if you refer a "big fish" once and awhile you'll be pulling in $hundreds of dollars on ONE customer. That's very tough to beat for PPS programs!
Why? #2: Programs like Legendary Lars, PussyCash and WebCamCash regularly have contests and promotions they advertise on adult webmaster boards (like GFY) where you can earn $50 - $100 (and more) Per Sign-Up! Again, few other PPS programs can offer this.
See my list of
webcam sponsors for details on some of the best programs, including which payout by ePassporte.