i vote ccbill, but really it depends. it takes me months to trust that a sponsor will pay me direct, and after a couple years of ontime payments, a couple sponsors stopped paying me, each owning thousands of dollars. but what dzinerbear says is true – why not ask your affiliates?
on the other hand, if you’re trying to get more affiliates, that becomes more complicated. unless… can you offer more than one option and let each affiliate choose which they prefer? you could offer ccbill direct, ccbill via nats or paxum… unless there’s a reason you can’t pay by paxum.