It's early days, so anything is possible. If we look at their productivity there is also no striking difference, it's just that Arsenal are superior in this regard, but in my opinion it cannot be a consideration to predict what will happen in this match.
Maybe I will look more at their status in this match, yes Arsenal will have home status, while Manchester United will act as guests. Maybe that can be more motivation for Arsenal, because they will play in front of their own supporters, and as we know that in football, supporters can be the 12th player.
My personal opinion is that Manchester United is just not stable enough as a team right now. They have brought in some new players who are yet to get set with the team. I know that arsenal has also brought in some players. But Manchester United did definitely gamble with the transfer that they had made. And of course the homeground advantage is going to be with Arsenal.
But even though I am saying that Arsenal is going to win the match, Arsenal should definitely not underestimate Manchester United. Which I don't think arsenal is going to do anyway, but that is one reason why Arsenal might lose. They cannot take things easy at all against Manchester United, who has definitely been showing some good performance recently. Manchester United does look to be improving.
Well there's nothing wrong with that, because after all there are different perspectives between us looking at the strength of these 2 clubs.
There are things that both clubs can use to beat each other in this match, even though Arsenal are better as you said. I mean Arsenal are not without gaps and neither are Mancehster United, and I even have to look towards the match ending in a draw, and that could be a good and fair result for both clubs.
You look at the transfers Manchester United have made, and I haven't noticed any significant changes from them.