First of all, Manchester City is currently struggling with several players injured. This is unfortunate, considering last season was similar and their recent results have been disappointing. On the other hand, Manchester United looks more stable, showing a positive trend.
I won’t really say Manchester United performance looks stable, if you check the two teams performance, then you will see that the two teams performance is really poor. I don’t really see anything stable in Manchester United performance, 3 matches has been played, and they were able to win just one match, with Manchester United current performance I won’t say they are stable right now.
There performance is poor and we can't guarantee that Manchester City or Manchester United will win the match, is unpredictable because both are struggling to win matches this season. Manchester City lost last game and they will play tough match this weekend against Manchester United and Amorim as be trying to build the team better and won't like to lose against Guadiola this season so that he can maintain is position. And the game can end in a draw or Manchester City can be the favorite but if I check how they play against Brighton I will probably said Amorim will win the match because Manchester United have good strikers then Manchester City are not all Guadiola squad will be available for the derby game. If you want to bet of the game is to play under 3 because I don't think goals will be much in the match. Anything can happen let just see how the game will probably ends.