Statistically they look the same, so this is really not an easy match for them. Both Chelsea and Manchester City need a win to maintain their position. But in terms of appearance, they can also be said to be the same when we look at their statistics in the English League this season.
However, Manchester City has another advantage, yes they will play as hosts and usually the team that plays as hosts is more favored to win the match. On the other hand, they also have to play a match in the Champions League first which will be very draining.
The race for top four is among many clubs, not only between Chelsea and Manchester City.
Manchester city playing at home mightn't help them as Chelsea are very good when playing away and not at their hom, they suck at home and it torment them as clubs take points off them at home. It would had been better for Chelsea to be home while Manchester city would had be away and the game might have shifted to the favour of Manchester city. Manchester city hasn't recovered from their poor form as they couldn't defeat PSG after going ahead with two goals. Pep Guardiola hasn't figured out what the problem of the club is and soon he'll be facing very tough opponents that'll make him lose many games and that won't be good for him
Manchester City seemed to come back to good form, but a shocked defeat by PSG after leading that opponent with two goals, shows that Manchester City are still very vulnerable. Their defense is not good and it can be easily exploited by speedy players of their opponents. PSG broke down Manchester City defense system with some speedy attacks or counter attacks. Chelsea have enough players like this to do the same in this Super Sunday match.