Years ago it was not a question for me, I was ALWAYS revenue share (I only promoted programs which I felt would retain). However with the decline of the industry I have gone to PPS on a lot of them.
If your traffic is VERY targeted I would still go the revenue share route.
I generally start out on revenue share, give it a few months, go back and see if I am getting any renewals. If I am not, I will switch over to PPS.

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