Manchester City are generally stronger, more stable and much more confident than Chelsea, so they have every chance to win and may not even have to work hard. Chelsea are not the same team, they are fighting for a top-10 finish, it's not even serious, they will be playing against the team at the top of the table, there is no chance.
Of course, Man City is much stronger than Chelsea. If we consider from the quality of the players and coach, Man City should win the match. However, sometimes it can't guarantee the win because it depends on how the teams to play during the match. Which team who can play more confident, can win the match. Chelsea looks to have better results in the few years ago. This can be a motivation for the players to play better when they are against Man City.
Manchester city has proven themselves in so many matches, that they are stronger than Chelsea which we have seen the results they got to became a winner in the last season from the premier league competition. Before you rate a team players or coach, you have to look at the area the players or coach has caused their team to win a particular title, which we have seen those things among Manchester city players or coach, that is giving people confident that the tournament will still end up for the favour of Manchester city again. When those potential players was with Chelsea in the last three seasons they performed well but Manchester city still remain among the top teams then.