Its a toss up for me... I've had several fish hold the jaugernaut hat. Had a 6"male escondido run my 180 with 6" male umbee, 6" male dovii, 2-5.5" female true red devlis "which he was dating at the time."
then i did some moving around and threw a 4.5-6" grammode pair in and they would have shredded the entire tank within minutes.
I also had a 6" Male Odo that killed 5 or 6 females, pleco, couple pairs of cons, beat on festae's and beani's.