Even with a guitar around his neck Bryan moves around a lot more than Jon does without guitar. Nowadays there's no aspect where Jon is a better frontman.
And it doesn't matter if Bryan is allowed to use lights or videos. He would even kick Jon's ass by playing acoustic without PA in the afternoon sun.

I like the combo. If they tour Europe together as well (what I don't think will happen) I might consider buying a ticket for a Bon Jovi show for the first time since 2013.