As far as I can see from Prtox's website Server is very much a different product from form or Direct -
Protx ProductsMy reason to use Server (or Form) at this point is that I've been using Direct on our site for a few years and now need to upgrade to allow 3D-Secure checking before the July 1st deadline when UK Maestro cards will no longer be allowed without it. As I'm struggling to make my site work with the 4.4 version of Direct contrib (specifically kicking off the 3D-Scure checking - everything else works), I need to put Server or Form in place as a temporary measure to continue taking orders.
Just to give a little more background as I know you're involved with the Direct contrib, I run a heavily modified version of osC so it's not just a case of plugging in this contrib. And when I say modified, I don't mean with lots of contribs added - the cart has been altered radically using our own code.
So I guess I should just use Form for now?