Manchester City is currently on a good run of form and seems like a team that's back to their best and I think their incredible comeback against Club Brugge last night tells how great of a team they are. Playing at away against Arsenal will really test the current strength of Manchester City and playing under a manager like Pep Guardiola who's ready to do anything possible to help the team remain in the top four, I expect Manchester City play at their best in that game.
Mikel Arteta's Arsenal on the other hand are trying to catch up with league leaders Liverpool so you should also expect the best from them. It's a difficult game to predict if I must be honest but it's my wish that Arsenal gets the better result at the end of that game