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.
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
Then as for pep guardiola figuring out what's wrong with his team, I believe that he already knows, he knows that they need to deep into the transfer market and replace most of his ageing stars which age are now telling on them, and I believe that it might take them three transfer window to fix that, which might cost them a whole full season.
But as for this game, I believe that it might ends in a score draw, or Chelsea win by a close margin.