Gio was much more pacy, he was in fact a proper wingback, he had a great cross, great long shot as well. He used to beat his man a lot. Blind has a good stamina and speed, but his pace, his "acceleration" so to speak is rather average at best, his dribbling weak as well, he hardly beats a man when he plays on the left in a Gio's fashion.
As i 've said Blind might be better, but his the same type of player as Phil. Blind has a slightly better passing range, but he is, as Neville was, a "no-nonsense passer". He keeps the ball, but hardly make many adventurous passes, he is not a playmaker-type of player. Phil Neville did that job exactly win the ball back, mostly play it safe.