For Arsenal to be a serious Premier League title contender for two consecutive seasons shows that Arsenal is good and will have seen it when Manchester City failed to beat them at Etihad Stadium this season. I'm Manchester United's core fan, and I would love to see Arsenal lift this season's Premier League title. Arsenal has put in a good battle to be in this position, and they deserve to win the Premier League title this season.
If you are a big fan of Manchester United, of course I know how you would feel if it were Liverpool who lifted the trophy this season. So it is quite natural for you to choose Arsenal as the team that will lift the Premier League trophy this season, because if Liverpool lift the Premier League trophy this season, it will equal the number of trophies that Manchester United has lifted in the Premier League. And on the other hand, I also understand why you don't choose your city rivals to lift the trophy this season because Manchester United apart from having a big rival with Liverpool, also has a big rival with their city team (Manchester City).
Actually, in the past, Arsenal was a competitor for Manchester United, that happened when Manchester United was still managed by Sir Alex Ferguson and Arsenal was still handled by Arsene Wenger, we saw that when they faced each other it was a very heated match for both clubs. But unfortunately it had to stop due to the decline in performance of both clubs and one of the factors that caused them to decline was the departure of their coach.
Now I agree with you that when supporting Arsenal more than Liverpool and Manchester City, especially in supporting Manchester City. We know that they are city rivals, and their rivalry has been keenly felt all this time. So when they see their city rivals winning championship titles again, even in a row, it will definitely make them angry, because they don't want to see rival clubs being better than them.
However, now the opportunity is still open for these 3 clubs, we still cannot confirm who will be the champion between them.