Most vote Superman ONLY because of red white and blue.
Power wise, Goku is above him because of the ridiculous power jumps that even DB fans themselves hate.
We haven't really seen Saitama limit because he one punches everything but I'll actually put him below Goku and Superman. Reason? Most of his opponents so far are terrestrials, except Boros. Superman and Goku have constantly been defeating beings from other planets known to be world destroyers. Boros claims he got bored of destroying planets, but we haven't actually seen him do that. While we have seen Freiza, Darkseid did those.