For all his faults, it's quiete easy to see that Antony is a better player. Pellestri is a bench player at best
What's quite obvious to see is that we won't get much creativity and goals from Antony, which we still don't know with Pellistri because he is played total of 4,5 games,in which he wasn't any worse than Antony on average. If we don't give him a chance - same as we did with Antony, we will never know.