CPA is "cost per action" which will pay you on a sign up but not necessarily a purchase.
Revenue Share pays you a % of the monthly membership fee that you bring to the company. The CPA payout is much lower than the Rev Share but easier to convert.
You won't be able to tell which works better for you until you get some conversions and see what types of conversions they become. Good luck.
No prob. Most of the time when you start out with a new offer, it's best to start with CPA and if you're converting those well, then move up to rev share. That's just text book tho and if you've had affiliate success before and think you can convert rev share right away, then go for it. There's much more money to be made with rev share.
I was wondering how long it would take until someone started talking about this payout model. Damn, looks like you networks copy everything from the adult industry these days.
I agree that you should try both models first and see which one works better. It also depends on the offer but in my experience revenue share works very well, especially in the long run so I prefer to choose rev share whenever possible.