Scada client-server (comparison)

Often, when entering a particular object, a task arises that requires the creation of a feasibility study of the SCADA (SCADA) package for use in the project. Which one is better? Which one is cheaper or more expensive? How do you choose if it is very difficult to see and try?

For this, the experience of different people, integrators (developers), freelancers, familiar customers is used. Polls are being made.

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