We don't know yet if the Red Devils would be able to match the Gunners this time around. If I'm not mistaken, Arsenal only beat them once last season so maybe there could be a difference this time around. The fact that Arsenal has landed Gyokores should not mean that they are unbeatable because other big teams have also added to their squad. All I see is that the confidence level of the Gunners would be higher thanks to the presence of the Swedish goal machine.
The Premier League opening match have a lot to prove to the world, both fans are anticipating to see their new players in action, and that match is a match that has been usually a tough one because it is a Darby match that both teams need to prove a point. Amorim will want to start proving himself as a coach that has made some changes in the team because he promised to make everything better next season and Arsenal match will be the first match to prove his point.
Nevertheless; Arsenal signed a lot of players which Victor Gyokeres is one of the best and the most important one among them because Arsenal has been lacking reliable striker; while Manchester United also signed some players which Bryan Mboymo is also one of their best signings since he will help the team up front and to improve their goal scoring ability.
Statistically, Arsenal has been defeating Manchester United in the Premier League for the past two season, and I think Arsenal will also wants to start the season well this time because they will want to do everything g possible to win the Premier League next season especially after signing a striker.