Red tiger motas are underrated in aggression, a 10-14 inch male would dominate almost any other similarly sized cichlidIn a way this is kind of a pointless thread as all of us can never compare each other's fish directly and each fish / tank setup is different. Ie someone's GT is going to be soft and others will terrorize. Based on experience I believe both are true. That said, I'll chime in with my experience of owning many of these fish before.
1. Dovii (no comment here)
2. Male Red Tiger Mota (surprisingly aggressive, since most people don't talk about these I did not see that coming. Had to sell mine at 6 inches because it would relentlessly take on 10 inch fish)
3. Full grown male carpintis (I've had smaller ones that were soft but one time I bought a full grown male and it was on a mission to kill everything in the tank. Broke my heart to sell it)
4. Full grown male jag (amazing fish but also usually pretty deadly)
Haha you're right about the clarias... although not "aggressive... just big pigs..I would say a Snakehead, my snake head at a northern pike almost 3/4 its size amazing feat for an amazing beast. i was not happy about it but it is a true story happened about 35 years ago. also i would like to mention a beast in it's own right, i owned an albino Clarias Butrachus (walking catfish) about about 40 something years ago (i know i dont look my age lol) this thing ate everything it was an absolute glutton if it could fit in its mouth it ate it. they happen to be banned at this point so my trying to get one is about zero but i would like to own another one, saw one in tank from Thailand on FB first one i have seen in a private tank since then.