Maybe the problem is whether Arsenal can continue to be consistent throughout the season? we often find that Arsenal always leads the top of the standings at the beginning of the competition to the middle, but they are always destroyed when the competition is about to end. I think Arsenal's job remains the same, namely to continue to improve the consistency that so far they have not been able to completely fix.
Arsenal are very inconsistent with their performance and it is like their chronic problem in last twenty years or longer. They can have many good matches but when expectation on them is very high, they failed to beat pressure and start to lose more matches. A last season is the same with Arsenal as they failed under pressure and lost some matches to lose all advantage they got in most of season.
Meanwhile, Manchester City can sometimes do two things, they excel from the start of the season to the end of the season and sometimes even though they have slipped in the middle of the season they are able to correct mistakes to close the competition with a title that is their pride.
Manchester City have enough experience to win Premier League and they have habit to win it. They have very good players, deeply enough to alternate their players when the season comes to important months like after Christmas and New year holidays. It is their biggest advantage than many clubs in Premier League and if compare it to Arsenal, it is very big advantage from Manchester City. Arsenal don't have too many players to alternate like Manchester City.