Sorry guys, but we all know that Barbas should be High King and co-ruler of the world along with that weird kid from Whiterun who can beat anyone up, and Nazeem
Really I'd go for none of them..All of the Jarls have some kind of problem in terms of leadership (from being a complete ass, being Ulfric, seeing visions, etc.) so I'd probably just turn the Moot into a ruling council and possibly rope the Greybeards into it to be moderators... I mean, Season Unending worked out so well, everyone was equally happy.
I am just imagining a child and a dog defeating armies of Thalmor, Tsaesci, Maormer...
Long live the immortal rulers!
Also, Clavicus-Viledonia is a catchy name for a continent.
What could go wrong with having a daedra (who serves one of the more malevolent daedric princes) ruling all of Tamriel Clavicus-Viledonia?
I vote for Brunwulf Free-Winter. Always liked that guy. A voice of reason in the chaos and rabid mania of Windhelm. I'm sure Jarl Ballsack would probably be fine... He's always been sorta 'meh' to me. He takes a stance when he has no other choice and lets the war divide Whiterun until just about the last possible minute. I get not wanting to go to war, but I mean c'mon. Show some stones, man. The rest can all rot on their thrones and shit in a bucket.