Choose the cheapest, the prettiest, or the most interesting for you. Sounds silly or straight?
Imagine that it doesn’t matter which SCADA system you get to know because the principle of operation is the same in all standard systems. I recommend choosing a known supplier who has a wide spectrum of modules and extensions because it will allow you to find more fun in getting to know the whole system. When deciding to learn or learn about the SCADA system, focus on getting as much information as possible (available online courses, YouTube and forum) where it will be fairly easy to ask about issues that bother us. Most of the systems offered on the market allow testing our system in the DEMO version (e.g. 2 hours of work or messages informing about the demo version).