Completely different players - Walcott is explosive. You’re right though - purely based on footballing ability e.g passing, control, vision, creativity, intelligence and what they do with the ball - they are miles apart. Wilshere is a much better footballer.
If Wilshere didn’t have his injury problems then we wouldn’t even be mentioned - it’d be Man C, Barca, Real.
Regardless, I think this is nothing more than his agent touting him about to force Arsenal’s hand.