Yes he is planning on building an app that will high performance, security and a one that will scale as it grows. He is actually considering a dating app . He is from a perl background
Go with Go.
Is he planning on making this as a desktop app? Because unless the answer is yes, neither of those languages are possible options.
No web app
If he is considering building something "proper" he should probably try both languages to see what he likes.
9/10 Go will be a lot more performant than python. But quite often it's not the programming language which really limits your performance.
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