Before playing for Inter Milan, Onana played some seasons for Ajax Amsterdam where Ten Hag worked as a coach. That is one of reasons Ten Hag brought Onana to Manchester United like Martinez.
Comparing Onana and De Gea, if it is only about saving ability, De Gea is better. If it is about passing, in theory Onana is better but the yesterday match with Galatasary shows that Onana is not too good with passing. With a goalkeeper, is passing a most important skill?
I think the most important thing is not about passing. But it's about how a goalkeeper can always save the goal. And how he can read the opponent's foot movements in directing the ball. So you can make decisions more quickly when the opponent's shot is fired. That is what is called a goalkeeper who is good at reading the direction of the ball. But for me, Onana is quite bad at reading the direction of the ball. And I agree De Gea is much better in this regard. I think Onana must learn to strengthen his mentality as a goalkeeper. He always seemed hesitant in making decisions.