Affiliates that choose Push over PPV or vice versa, why?

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I've been thinking about this for a while, and looked at the cons and pros of each ad format, such as push likely not needing as many clicks as pops to convert. Or pops only needing a landing page and no images but the traffic also being of lower quality. But for those of you who choose Push notification traffic over PPV, what are the main advantages push has that you see better than PPV, and same question applies to those choosing PPV over push traffic? I'd really appreciate hearing your thoughts on this. Why choose