The first 3-4 rounds could be rough for Crawford but I envision a late Crawford stoppage or a wide decision win.
Horn is physical and tough but he is defensively vulnerable and he can be hurt. Old man Pacquiao almost finished him in the 9th round when they fought...
Crawford got hurt once too but that was years ago and he said he learned from it and won't ever be so reckless again when he just blindly went for the kill against Gamboa and got caught with one good shot. Horn can't do the same cause he was almost KOd by Pac due to his defensive flaws/lower skill level, not because he got too reckless.
I can see Crawford stretch it out too, Horn's side did a lot of trash talk to sell the fight... Crawford is a sadist in the ring who likes to hurt you, especially if you talked trash, see Lundy.