Depends on how they're treated, IMO.
I have a flowerhorn and Midas about the same size (teenager) in two adjacent tanks, and have noticed that interestingly, as the midas is really agressive (though not a glassbanger, per se, he runs laps with me and does threat displays and lets me touch him), the flowerhorn seems to "think" slower in some way. She's much more contemplative in her actions, and moves much slower. I think this is beacuse of the family history they have being a stalking predator, which often seems to make an animal more self concious and calculating. Whereas the FH takes time and makes exact movements in the water, the Midas uses more brute force and often more effort that is needed. Not to say that one is smarter or more agressive than the other, but they do have markedly different though processes; I believe that this is related historically to their feeding and social strategies. (well, the origin fish for FH anyways, and granted that FH have many different species that vary wideley. In this respect I believe that behaviour has much to do with individual species).