Both clubs are stronger now especially now that there are more equipped with elite players on their teams and I think the current Manchester United is strong enough to take down Arsenal in a full time match. Haven't you been watching Manchester United pre season matches,they have been playing unbeaten and their performance was satisfactory unlike Arsenal who inspite of having the over hype Viktor Gyokeres was still defeated by Tottenham. In my own opinion & prediction in the match between Manchester United vs Arsenal, I think since the game will be played in Old Trafford, the home ground of Manchester United already gives the Red Devils a higher ground and greater chances of defeating Arsenal.
Although both team have strong squads , but we do not know yet whether the new players have been able to adapt to their squad. Arsenal bought Gyokeres, zubemendi and Madueke. However, Gyokeres and Zubemendi are talented, there is no doubt, bu they ar not well- acquainted with the gaming strategy of the Premier League. On the other hand , Manchester United's Mbeumo and Cunha have been performing in the Premier League for a long time. So, they will probably be able to adapt to Manchester United quickly. Although Arsenal are considered favorites in this match, it will not be easy to beat Manchester United. I would like to see a better performance from Cunha and Mbeumo.