`async` is F#'s original implementation of async programming. It is the precursor to C#'s await/async.

`task` targets the .NET TPL instead, which is also what C#'s await/async and all of .NET *Async methods use.

While the `async` implementation still offers some benefits over `task` (cold vs. hot starts [0]), my advice is - if you're doing backend code on .NET, you should use task. The tigher integration with the .NET ecosystem & runtime results in better exception stack traces, easier debugging and faster performance.

[0] https://github.com/TheAngryByrd/IcedTasks?tab=readme-ov-file...