The only reasons you'd usually wait for the river was if the board was something like JJ24 and you figured it was a toss up between him either bluffing or having a PP that would pay off the same on either street (or not at all). A turn raise is going to get paid off a lot here. You'll also get a lot of check-fold from any whiffed draws on the river.

That's why a lot of players wait to raise the river in defensive HU situations with position and very strong hands: their opponents have air a large portion of the time.