Hi @aziz,
I can only speak for myself. But same as you I have used Delphi (mostly with DevExpress) on windows for many years (starting with D3).
This is my first foray into app development - I spent a few months with FMX and Skia but was not happy with the results.
I stumbled on FGX and can say its stable, compatible and even more importantly Yaroslav & Viktor are responsive in the forums and address questions and bugs quickly and professionally.
Personally, I prefer to code in pascal. It's far more readable that java-type langues. And you still have access to a lot of the Delphi non visual components.
The only time my FGX app has frozen or crashed is if I have made a mistake.
Hope this helps.
Alan