Paypal vs. First Data vs. Nova for payment processing?

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I am shopping for a payment processor for a subscription-based (recurring
payment) website.  I need it to be easy to implement and automate the
recurring charges.

I've review the details of paypal and First Data.  I like First data so far
but have heard some things that might not affect my business model but might

Paypal is easy and free but they "encourage" non-members to become members
and I found it confusing to use when I tested it as a non-member.

I have not researched NOVA yet.

Any thoughts or your experiences with any of these three would be much

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