United vs Brighton will be a great game, United is doing alright and they built a squad that is definitely entertaining to watch, they have good like 20 or so players and that depth will help them all season long. Brighton however started the season unexpectedly well and looking like they are actually very well, it is a great deal and we could see them do greatly this season, much better than expected.
Manchester United's past memories against Brighton are not pleasant. Manchester United have lost three of their last five matches against Brighton. So there is no chance to say for sure that United will win against Brighton in the next match.
Manchester United's squad is strong. But the Brighton team is not weak. This group is also quite strong. Brighton did not perform well last season. So this season the team is trying its best to form a stable squad. I saw the performance of the Brighton players in the first match against Everton. An excellent 3-0 win for Brighton. Brighton will also play at home against Manchester United. Players will be more confident at home. So I can't consider Manchester United as favorites in this match.