With Manchester United present form, they could play and win anyone, Arsenal included. The fact that Arsenal had won them earlier in the premier league doesnt mean they can win them again. Manchester United has gotten so much better.
I believe Manchester United pretty much has the drive and pressure to go ahead and win any team they encounter. And now that they have got the right leadership in the form of the coach Ten Hag, its just a matter of time before the trophies come rolling in.
The shape of Manchester United is laid out, they have a clear direction for how they will move. Their games are also much nicer to look at, more organized in their attacks and that is something I haven't seen from their games in a long time. They just need to mature it again, and I'm sure Erik Ten Hag will be able to bring Manchester United back to its former glory.