The drop-off rate is going to be much higher for Amazon than Paypal. Amazon payments requires you to have an Amazon account and signin to it to make a payment,

The drop-off rate is going to be much higher for Amazon than Paypal. Amazon payments requires you to have an Amazon account and signin to it to make a payment, with Paypal you can just pay by credit card. If you're VC funded I'd go direct to a friendly merchant account provider (you'll need to put down a substantial deposit as you're in a high-risk business which is why this is only really an option if you're funded), otherwise I'd just go with Paypal (which is what most smaller marketplaces use).