I don't think City's XI is comfortably better.
Keepers even
Fullbacks go to Arsenal marginally
CB goes to Arsenal, with the injury to Kompany
CM goes to City, with Coquelin's injury
Wide players are even
Ozil and Giroud are probably only half a step behind Silva and Aguero, and on form, ahead
City are pretty tough to judge because any half decent team can properly abuse them through the midfield, but they're always there or thereabouts in the title race thanks to their attack