Just wait next two weeks until she finally manages to set up and compile Hello World... I am exaggerating obviously but it just did not work for me as easy as RN. I know people who are happy about it and use every day at work.
I feel confident in both JS and C# so it might be up to one's preferences as well.
Is it even usable in Linux and macOS?
Xamarin? Not sure to be honest I did not last that far to find out. :-)
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