Arreola by KO EARLY. He'd have Fury on the backfoot all night, so long as it lasted. As others have said, Fury has the better win, so-so, but Arreola has the chin, thew power and the guts to take the fight to Fury and finish him. And Arreola's resume gets better with every win by McCline, Walker and Witherspoon, although that was back when he was fighting promising prospects, fringe contenders and Blevel opposition as it were.
I think Arreola will give Fury problems at the start of the early rounds. But i can see Fury weathering the storm, and gaining confidence as the fight progresses. I reckon Tyson will impose his significant size advantage and outbox Arreola over the majority of the rounds.
I like Tyson Fury but I think he is not ready for this match up at this point. I think that Arreola would be way too strong for him and probably stop him in the middle rounds.
Despite both guys development over the past few years being somewhat disapointing i think that Arreola despite being the smaller man would most likely walk the younger Fury down and stop him around the 5th round, would be a highly exciting matchup.