Before Onana moved to Manchester United he was certainly among the best goalkeepers in the world and has been proving that since his Ajax days when they were knocking out big clubs out of the champions league. David De gea was a great goalkeeper and servant to Manchester United but was definitely passed its best in the last two to three seasons in Manchester United Jersey.
As for Maguire, he has proven today that this formation by Amorim will favor him as he wouldn’t get exposed too much, today he had his battle with Halaand and he kept Halaand silent all day which was a good sign after returning to the team. For now both players haven’t done much wrong
Yes Onana was a very good goalie before moving to Manchester United, he holds the record for most clean sheet kept in the EPL so far this season and also won the November save of the month, but I’m afraid his errors has overshadowed his good performance at the club. Manchester United fans are questioning his ability as a goalkeeper, his errors in vital matches can't be overlooked simply because he hold he highest number of clean sheet. I think Onana should up his game if he still wants to keep his job at the club.