Depends on what your plan is - a few quick extra bucks I would choose PPS, and Revshare if you plan to use them long term (whales might drop by from time to time) - however I have been told by many that they have a hard time converting Streamray, so it could just be that we have very target traffic, which would convert even better at other cam networks (our traffic have mainly been from passive typins on category killer domains).
Best advice is to look at what you make per unique, and go by that
