Definitive Beethoven's 9th recording

The best performance on a recording? Hard to say. Try Karajan (1977 as well as the '63), '89 Bernstein, '87 Solti, '51 Furtwangler, or Klemperer if your looking for performance without the sonic gymnastics. Newbee is right - there is no one definitive performance. Other than the premier in 1820-something.

Bruno Walter/Columbia. Tweekerman

Really hard to say...

Bernstein, Christmas 1989
Bernstein, Vienna Philharmonic
Hogwood, Academy Ancient Music
Colin Davis, Bavarian Radio Symphony
Von Karajan, Berlin Philharmonic
Fricsay, Berlin Philharmonic
Jochum, Concertgebouw
Ozawa, New Philharmonic
Schmidt-Isserstedt, Vienna Philharmonic
Solti, Chicago Symphony
Stokowski, London Symphony
Szell, Cleveland Orchestra
Toscanini, NBC Symphony

Try Furtwangler's Bayreut recording from the early '50s. (Note however, that the orchestra is below stage level @ Bayreut, so it sounds as if it's playing on the floor!)
There's also a 1936 recording of Furtwangler/Berliner which, IMO is even better (as far as one can hear it).
Finally, I heard (but do not have) an E. Kleiber/Berliner(?) recording that impressed me...

Karajan/Berlin Philharmonic on Duetsche Grammophon late 70s version, without question.