William Gallas played under Jose Mourinho at Chelsea and then Arsene Wenger at Arsenal so it's safe to say that the former French international is allowed to give his opinion on the pair.
As theMirrorreported, Gallas chose the current Manchester United gaffer as the better manager, explaining that it was the Portuguese boss' constant attention to detail in training which separates him from his French counterpart.
William Gallas explains why Jose Mourinho gets more from his players than Arsene Wenger https://t.co/Yqncj8hyDj pic.twitter.com/9ckf8G1SiT
"The difference is that both managers want to win trophies, but with Jose he will show you everyday at training.If you are not 100 per cent he will stop training and say to you 'what's wrong with you, why are you not training?
"If you don't want to train then just go outside and run, because what I want, what I expect from you is to give me everything in training and then you are ready for the game.
"But with Arsene it is a little bit different. You have that responsibility to manage yourself, he won't be behind you all the time.That makes a difference, so for me it was very good to be with one manager who was always behind you."
Arsene Wenger and Jose Mourinho are slipping... there's a new generation of managers in town. https://t.co/G0zrvxyufd pic.twitter.com/FAcF0rT1Lq
The 39-year-old was a common fixture under the Special One at StamfordBridge playing consistently between 2004 and 2006, where he was part of the Blues side that won consecutive Premier League titles.
He then moved on to play under Wenger in North London for four more seasons, before switching the regional divide to sign for Spurs during the latter stage of his successful career as a footballer.