I think the Bubblegum Kid takes this. Harry was a bit of a frontrunner IMO and Sean was more gritty and willing to mix it up and push through to win.
O Grady in a body punching clinic flattens Youngstowns 2 best lightweight in the 80s. But don't worry Harry, he bodypunch KOs the Boom too.
Despite his nice guy image and good looks, O'Grady was rougher and tougher than he gets credit for. O'Grady grinds out the win, either by UD or a late stoppage.
Sean had too much on the ball for Harry. I agree with @The Morlocks re the body punches....Sean would have controlled the fight with bodyshots like he did with Hilmer Kenty. Underrated fighter Sean O'Grady.