I've just finished a technical proposal for a big migration project of a Level 2 and Supervision platform from UX System V to Windows Server 2008/.Net
Level 1 to Level 2 process control will be connected through our proxy (which guarantees high performances). The supervision system will be connected to Level 2 through OPC.
I'm evaluating 2 OPC servers:
From a technical perspective, the architecture are differents but the features are quite the same.
From a sales perspective, the proposal is easier to build using kepware offering (too many options in matrikon price-list) :-)