for Arsenal performance, I have no doubt that this summer Arsenal has had a very good performance and has improved very much, but to be successful in the champions league, I think I am a little doubtful. because Arsenal have to get past rival teams like Man City who are currently in a very strong state and also Real Madrid who are currently aiming hard to win the title after failing last season.
so its not easy for Arsenal to have to go through this big team and if they fail again to get the title this season I think the mistake is the strategy used by the coach himself.
It would be more realistic for Arsenal to have the ambition to win the EPL trophy next season, but it does not rule out the possibility for Arsenal to go further in the European Champions League. regardless of the current posh squad, the biggest luck if they do not join the group of hell. This will automatically ease their steps to advance to the next round.
Sometimes all predictions can be reversed, we will wait for how this squad will rise to win the championship trophy that failed last season.
Compared to Arsenal, Manchester City is far ahead in terms of performance. I think Manchester City will be Arsenal's arch-rivals this season and a great problem going forward. The Arsenal team will have to work incredibly hard and use great tactics to beat a team like Manchester City.