Wondernine
Rhineland on the falfiles chambers the FAL in all kind of crazy stuff. He's a master.
I can't see an FAL in 9mm though. Seems like you get an awfully heavy package for the cartridge you're shooting. If you're looking for a 9mm in a "military" package, hard to go wrong with an upper for and AR. Unless you get a 9mm purpose-built rifle like a Storm, HK, etc.
Not sure I understand the 2nd part of your question "or any FAL. Are they better than ARs, comblocs etc."
Are you asking for advice on an FAL in general or on a 9mm conversion specifically? If 9mm, see my comments above.
If in general, it depends on what you want. Is a FAL better than an AR? Dunno, is a SUV better than a sports car? Yes and no...they're built for different things as are the FAL and AR (or comblocs...assuming you are using this to describe an AK).
Please clarify.