Pacino, Nicholson or Brando

I can't make up my mind about who should've won the Academy Award for best actor in 1973. Eventhough Pacino was superb in "Serpico", many consider "The last detail" to be Nicholson's best. And then there's Brando in "Last tango in Paris", praised by most film critics and intelectuals. Any comments on that difficult choice?

JUAN.