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I think your implementation is fine. I might write it like this, because I find it more idiomatic in F# to avoid guards (when clauses) in pattern matching where a guard free implementation is equally concise.

let fizzbuzz x = 
    match (x % 5, x % 3) with
    | (0, 0) -> "FizzBuzz"
    | (0, _) -> "Buzz"
    | (_, 0) -> "Fizz"
    | _ -> string x

[1..100] |> List.map fizzbuzz |> List.iter (printfn "%s")