Wish there was a Rhaegar/Jon, but well. I feel like they both had a similar flaw:virtue ratio, even though they both were fucked up in their own way. Rhaegar probably a bit more though. So Jon it is.
While I have no idea how it's connected to this post, it makes sense mostly. Their infighting was what brought many problems upon the dynasty alongside the incest. Just look at Blackfyre rebellion and the mad/good king ratio
Bran is the better choice then any of them perhaps except Jon but we know Jon would never sit on a throne and rule so it was best for him to go live with the free folk beyond the wall