#3 Less Pressure
Playing for a club the size of Manchester United brings immense pressure and expectation of performing to the best of your ability. The pressure can make some shine but can make others crumble. It depends a lot on mentality, but does Anthony Martial have the right mentality to play for Manchester United.
Going to a smaller club could be beneficial, bear in mind he is only 22 years of age, and he can always return to a bigger club because he has time on his side. With lesser expectations he could blossom
Look at Romelu Lukaku who spent a short amount of time at West Brom, did really well and has now returned to the big time with Manchester United. But for Martial's own sake and his own career it would be best to leave the club and to rebuild his stature elsewhere.ll be less pressure and lesser expectations. That could definitely help his development and his age allows him to come back to the bigger clubs later on his career.