Arsenal vs Brighton sounds tough and interesting, everyone will predict in favour of Arsenal cause what do you expect a home match, definitely they will attack Saka just like what Chelsea players did last time with Rice, Arsenal have every chance of wining this match and I'm sure they'll defeat Brighton.
Liverpool vs United, I know united fans has never loss hope in their players and they might deliver perfectly, have never supported Liverpool and I don't want them to be the tittle contender but the fact is they're really playing good this season every team they meet they'll always pressure, I can't predict for now.
Brighton is not in that form as the beginning of the season; if not, I will say let's watch and see what actually happens without choosing the favorite to win the game, but now with their performances, Arsenal is the favorite team to win the game, and again, it is Arsenal home games, which makes it clear that they have good records of home games this season, showing they always appear very strong in their home games, so with that, I can't say that Brighton may not have any good opportunity to defeat Arsenal.
As for Liverpool against Manchester United, the favorite team to win the game is Liverpool, and I have much faith in that, especially when it is Liverpool that is hosting the game. It is always very hard to defeat Liverpool in Anfield, so with Manchester United's weak performances, I have more confidence in Liverpool to win the game, but if Liverpool is not lucky, the game can lead to a draw, but I can't say Manchester United can win the game.