I've never had a dovii or an umbee but have had most of the fish mentioned in this thread. Pound for pound winner is the neetroplus nematopus. Festae would be #1. I had a ten inch male that attacked everything (successfully), including a 13'' managuense (which is no slouch either). Festae's and red devils are genetic gladiators. They are mean and extremely gifted at it. I would say thet are more ''athletic'' then the jags and dovii. Combine this with the Festae's size and demeanor, that makes them # 1.