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For the both team winning their first league matches doesn't guarantee them a nice spot at the end of the season, we might even get to see them drop below because most teams are still working on their transfer window which causes a lot unstable performance untill then it's a whole pattern of luck on who wins their fixtures. The match between Manchester United and Brighton will be tough but more of the odds to favor United only if they will be more clinical when having those opportunities, last match played Bruno and Casemiro had good number of chances to score goals but where incompetent to raise the number, I hope they do better this time.
Based on probability, Manchester United is not superior to Brighton playing at home. Brighton and Manchester United have a probability of winning that tends to be equal, but considering that Manchester United is a top team that has many good players, of course they are expected to be able to continue their winning streak.
The results of the matches between these two teams seem difficult to predict, but I don't really doubt Manchester United, especially if they appear impressive with good finishing. I don't expect a big win for Manchester United, but 1-2 or 0-2 is the most realistic. There are certainly probability for defeat, but I give Manchester United the benefit of the doubt.