I would say Feraligatr is the best out of the three due to the fact that it has an advantage over Rhydon an Tyranitar, type-wise.
Some people know to switch Tyranitar out when they sense a Close Combat. >_>Tyranitar is definitely the best out of the three listed. But tbh, I don't cower in my boots when I see a Tyranitar. I just predict a switch and KO it with Close Combat.