So. In your opinion. Who would win in a one on one fight?

My bet is on Mannimarco. Because he was the first ever Lich Lord and he's defied death many times and also escaped from being imprisoned by Molag Bal.

Honestly I don't think he's dead after oblivion seeming as he has this nasty habit of coming back. Plus he's more than likely lived a bit longer than Lord Harkon before he became a vampire lord.

I was going to say this would be in a different forum, but I for the life of me can't figure out what.

Anyway, Mannimarco. Harkon is pretty much a complete jobber, both in-universe and out.

First successful one really. There are "Liches" older then he is, but they all more go for the "walking corpse" look.