Discrepancies in a matter of clubs economy looks like a small misunderstanding. Both clubs made good job simply. Hard to argue, that we ve been invested into massively, but the point is we done very well with it (unlike many others). As many saying within industry - City is a benchmark (Perez, Tuchel for instance), we are quite literally on a diapason as a club (last Ballon d'or award), fighting at a sporting level for everything and we always there in a terms of a current very best teams in the world list. Some, including me, would say, that we are the best team in the world for last 2/3 seasons from purely football pitch perspective. Nothing has changed hear and we are on our way during next campaigne. We have similar PL point tally to previous seasons, we are in UCL knockouts with proper prospects on quartel finals, sometimes had really spectacular, exceptional football (would love a bit more of this, because actually its hard to recall upon this cathegory other game than against ManUtd this season regarding top opposition).
Arsenal works well, they also have invested, made transfers, there is no another way nowadays. Earlier they had different model, at the end its usually shall be a mix of various priorities (for instance: young, perspective players, but sometimes you need to find examined quality, like Jesus, Zinchenko and you need not hesitate to take this step). Sporting project is evidently on track, but we see how it works at this level, things can change very quickly, Liverpool, Chelsea are more than aware. I would not deprive Arsenal from insight, that they spent less over last 10 years, has generally less valuated players, but are at the top of the table. Its an achievement, does not mean one club is better than the other, at the moment still those clubs operate for different targets.