Sancho is a better player than Antony. There I said it. Sue me
Better technical player? Perhaps.
Better for the team? I don't think so. Antony gets a lot of stick and rightly so but he's a far more useful player for us currently - better defensive work, and is our only winger comfortable with hugging the right flank, Sancho's competition as it stands is both Rashford and Garnacho, both of whom he's behind in the pecking order IMO.
If we offload Sancho we'd still be relatively comfortable with our options on the left, though if we bin Antony we'd have to play Rashford right (his uncomfortable side), and hope Pellestri and Amad come good for us immediately. But that's all elementary since we're obviously not selling Antony.
In all honesty I wouldn't mind selling Sancho for £50million, especially if it means we can invest it in our parts of the pitch we're lacking in. From what I've seen these couple of years, I don't think he'd be missed.