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I can say that Brighton is not a top team in the standings. Manchester United can have a chance to win the match if they can get their best performance. But we can't underestimate Brighton. They can be very solid in some matches. I don't dare to bet on that match. I think the match will end in a draw.
Arsenal do have a very young and talented squad, so their inexperience may tell at key moments. On the other hand, I believe that they have developed quite distinctly in comparison with last season or the year before; finishing runners-up will be an important experience for them.
Last season and the 2 seasons before that they have improved a lot and those were some of their best seasons under Arteta. Their squad this season is still the same as last season. They just need to maintain consistency in every game. Arsenal's squad last season was very worthy of being champions and they deserved it. Unfortunately City were more consistent than them and managed to get a lot of points in crucial games.