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C# these days is GREAT, but F# still has features that C# doesn't like unions and much more powerful (and ergonomic) pattern matching.

And line for line, F# is more effective at getting things done (and i would argue with less bugs)

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The c# team is supposedly putting in serious work on Discriminated Unions. I'm really interested to see how it turns out because f# already does a great job with them.

Discriminated unions is probably the last "must have" feature I've been waiting for in C#. Better pattern matching would be nice to have but honestly not as much of a gamechanger.

The C# team for several reasons decided "rock solid" pattern matching was a higher priority than discriminated unions because good discriminated union code needs good pattern matching. In the last few versions of C# I think pattern matching has gotten really good. List Patterns finally exist now, and that influenced the new iterable collection initializers, which are also pretty good now. Last I checked, the C# team was still debating Dictionary/Hash key lookup Patterns and Dictionary/Key-Value initializers, and that's maybe my last big request in pattern matching other than native discriminated unions, of course.

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