well the dovi wolf cichlid is known to be the meanest toughest cichlid there is, but the umbee alot of times beats on the wolf cichlid no matter how much bigger the dovi is, so id say the umbee, even though its smaller, whos more aggresive??? i dont know, but its fact that the umbee and dovi are the toughest two cichlids there is, maybe something like the red devil has little fish sydrome causeing it to be more aggresive, doesnt meen its tougher though,
Hofly this answeres your question