which is best and why?

which would you recommend me?

which will make me have a bigger revenue?

If you have a membership based website, then CCBill or 2000charge.com (they are a gateway and will help you get a merchant account if your volume is high enough).

Both companies will provide the technical support as well and that will help you out. Internext is coming up in January and it is after CES so the hotels will be at regular price. If you are in the United States, you should consider attending Internext

ccbill for sure, it is much easier for the customers.
However, there are better options if you have decent volume.

CCBill is probably the most popular choice for paysites, they are good...