"He was a complicated guy.
He could have been interesting."
Yah. This was one of the times Lincoln politically screwed the pooch. Maybe if there wasn't a white supremacist as vp, assassinating Lincoln may not have been seen as such a good idea, then Reconstruction would have gone the path Lincoln had planned, and so on and so forth. But that's 100% counterfactual, which has no place in writing history.