Why not 15 rounds rez? If we can't have the true championship limit in real life, at least we can have it in these hypothetical match ups.
Ward has only a questionable decision against one quality light heavyweight, on that resume basis I must go with Conn by U dec.
Ward is arguably the best in-fighter in modern day boxing, but Conn would give him a lesson up close. Conn by decision.
I think this would be a close tough fight with two very mentally tough fighters going at it...both have multiple skills and fighting ranges.