If he can handle some spin and its speed I agree with Daiki Rubbers like Nexy Etika etc.
For more inexperienced Players I suggest, Gewo Thunderball² I used to play with them as a kid and won by just not making mistakes in blocking, pushing and flat hits
(could be just my experience). And these are cheap too!
In my understanding, something not too spin sensitive and controlled should work well. Not too reactive without strong catapult effekt are some keywords.