I agree that Igor is gradually leading Juventus to a stable performance. It may not be a significant improvement, but this positive trend must be continuously supported by the club management. Igor is shaping his team to achieve stability in every aspect. If they can become title contenders this season, Igor should be retained. This is the perfect moment when a major team is experiencing a slump, while Juventus is coming in with extraordinary motivation.
Tudor is a simple man (I mean it in a positive way) and he's trying to do simple things, and oftentimes the simplest solution is the best one. On the other hand last year Juventus began the season with Thiago Motta, a guy which is very full of himself and he puts his own results before the team's. He wanted to surprise everyone with unlikely line ups and players, and it's been a disaster. Juventus needed to go back to win matches, not trying to impress the world, and Tudor is doing exactly that.
I don't think Motta actually led the team to bad performances, but they weren't winning. That was the real problem. They had been losing in the league for a long time, and I think Napoli was the first team to beat them. However, they drew too many times and fell short of the top spot. This led to a managerial change at Juventus. There's a new coach this year, and he seems to be striving to do some positive things. We'll see where they finish at the end of the season.