But one thing I forgot to mention:
Have a look at the (UI) technologies that you need to automate with your RPA solution.
Because I can tell you:
Classic UI Desktop Automation can still be tricky. Also when using Robot Framework and the popular libraries. There are some commercial tools out there which have reliable engines.
If it’s all about Web Automation and some Excel things - you should be fine using Robot Framework.
Maybe a little less comfort due to lack of record & play etc - but it’s all steerable.
So the question is, what kind of applications you WANT to automate with your RPA solution.
That’s also something you shall keep in mind, when choosing an RPA solution.