Porter is taller, much longer, quicker and more athletic. Yes, Porter is getting knocked on his athleticism but that's viewed through the lens of a top pick. He has just slightly above average athleticism and that's the only thing keeping him from being a highly sought after number one pick. Otto has the length AND the feet to guard up and down, Dudley's lack of lateral quickness limits the kind of player he can cover. Neither of them is great at creating their own shot but again, Porter is far superior in that regard. Dudley is a better shooter from distance but that's a skill he developed after he left college and there's no reason to think Porter can't improve there too. He's certainly improved his mid-range game.
Steve