The way I see them is this. Hunt is Theresa May in trousers. He makes all the right noises, but so did she. Remember Brexit means Brexit, no deal better than a bad deal etc.
She didn't mean it and nor does he.
Boris was the big beast of the leave campaign and he has nowhere to hide on this issue. He not only wants to be PM but he wants to go down in history alongside the greats - Disreali, Churchill, Thatcher.
However, if he doesn't get Brexit done quickly and properly his political career will immediatelynend in disgrace, and the history books will tell how he really was nothing more than a buffoon, who thought he was great.
I think he is shrewd enough to realise this,and he also has an enormous ego. Therefore he has huge personal incentive to do whatever it takes to get it done.
I dont have a great deal of faith in him tbh, but he is the better of the two options.