I think its all personal. How tall you are, skinny or buff, wrist size etc. You can be tall but skinny, then a 47mm would still look ridiculous on you.
Im a 24 year old short 'n skinny dude, eventhough I'd love to wear a 47mm PAM I know it will look like Im wearing daddy's watch. That ain't gonna happen, so for me 44mm is the way! Whereas for a The Rock guy 44mm is small.
Besides all that I think a smaller watch looks more classy, regardless your body type...