The advantages of the XS broker are clearly described by the company on its website:
a) Worldwide access to services for trading
b) Increased transparency and safety of everything
c) Reliable organization with multiple regulations
But this list isn't full, because it's superficial and I treated it the same way. I prefer testing everything on my own first only then make rational conclusions.
After trading on the MetaTrader 5 with the possibility to engage into algo trading or just trade manually with a big range of timeframes and all modern instruments for chart analysis, I came to conslusion that it's good enough. Not a perfect broker, that's true. However, there's a charming highlight in it - account types. They cater to the needs of the majority and make XS universal.