Both.
A program with high retention is great for months of income...Especially when you make 15-20 dollars each month for the life of the member. I have a few GREAT revshare sites that I promote that make me a few grand per month JUST in rebills. As long as the processor stays afloat, the trend should continue for quite some time.
As far as PPS... It's great if you have a site that converts high and pays on trials. This is a great option when the site is plugin /upsell heavy without much exclusive content. I've been making a killing with PPS programs. I've mixed 4 days of PPS with 3 days of revshare per week and so far it's a great balance.
