Dumerilii or Leopoldi depending upon whom you believe has the proper name is the slightly smaller.
SnakeIce - I've just googled, and nowhere is the heigth of scalare listed as 12" and a 20 long is only 12" tall anyway...so that big angelfish would have had one fin above water if there was any substrate.
Unless someone has a good reference elsewhere, P. scalare doesn't grow more 8" in height - now P. altum is different and is cited as growing 12" to 15" in height.
Eric