I've dealt with both, and prefer CCBill.com, personally.
Automatic renewals, cancellations, support, and the secured online order page "cart" are supplied in full.
FYI, VISA recently inacted a provision where third party processors like CCBill and iBill must charge a hefty fee to offer VISA to its customers. You're looking at about an $800 investment, which may or may not be worth it, depending upon your customer base.
I'll agree that CCBill is just about the best for this kind of service at the moment. Currently I use both CCBill and iBill as sometimes you get customers who CCBill reject. But even with this I'm considering dropping iBill as their customer service is not very good.
I think their rates are higher than average because they handle tons of adult site payments which incurrs a lot of fraudulent chargebacks...
you're right that at 14% or so they leave something to be desired - i doubt you could use them to handle actual product sales as they'd eat up a big margin of your profits. But for subscription sales (i.e. adult sites) almost all of the subscription fees is profit, so 14% of pure profit is still pure profit. Its also my understanding that affiliate programs of adult sites will give affiliates up to 50% of the subscription fees!... no wonder we have so much darn gosh doodly spam.