This is Manchester city home Chelsea is coming to play and there is no how the match is going to be tough with Manchester city, because Chelsea will not going to achieve victory from them because their head coach will allow their potential players to work in a way they will perform well through out. I know that Manchester city is still experiencing some challenges in the areas of defense and midfield which their head coach is not fix yet, but they will not allow Chelsea to take advantage of that to draw the match 1-1 which I know that Manchester city players will not allow such mistakes to happen. The two team will definitely have a goal in this match, because Chelsea are very good this days which I know they will score goal but Manchester city will defeat them 2-1 at the end of the match.
Manchester City is strong but I think you are not giving Chelsea enough credit. Manchester City has good team but they have some weaknesses in defense and midfield that Chelsea could take advantage from. Chelsea has been playing well recently and they will probably give Manchester City hard time. I agree that both teams will score goals but it is hard to say who will win. Chelsea might be able to use Manchester City weaknesses to get tie or even win game. Match is going to be exciting and very competitive.
Manchester City defeat from PSG in the Champions League has shown how fragile their defence is at the moment, when they are lead match but not been able to maintain it until the end of the game, as we have seen in some of their games so far in the Premier League, so I think that will be taken advantage of by Chelsea who currently have the support of many good attackers to play offensively in the match, The match will be a difficult match for both teams because however the defeat and the victory will greatly affect their position in the top 4, but for now I think Chelsea have a chance to win the match, but we also cannot underestimate Manchester City who may also rise at the Etihad Stadium later, with the current condition of both teams maybe a narrow victory will be the end result from the match, So I personally might prefer to bet with the BTTS option to safe.