It really depends on what you are parsing. Currently I'm writing a text adventure in FSharp and I've decided to just use a tokeniser/parser that I wrote instead

It really depends on what you are parsing. Currently I'm writing a text adventure in FSharp and I've decided to just use a tokeniser/parser that I wrote instead of one of the bigger libraries like FParsec. When I was writing a compiler in Python the other year, I went through several different parsers but in the end I preferred Arpeggio.