Today's match is EPL for the battle for standings, not a community shield event, Guardiola will definitely always know how to deal with Arteta's strategic tactics in his team today, Guardiola certainly knows how to make his team play better against Arsenal, I'm sure Manchester City will provide another surprise for Arsenal and they will return to winning ways to stay at the top of the standings.
But did you know that Arsenal is Manchester City’s toughest opponent last season? Arsenal were able to make Manchester City look like they don’t have quality players that can play a possessive game because Arsenal control the matches they played last season both home and away matches, they were just not luck and inexperienced and they made mistakes which is where Manchester City took advantage and win the matches; this season, Manchester City is not in a good form due to injuries but I know it is always a tough match because they will always like to beat Arsenal, but this time we might see a different result.
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If you look at the strength of both of them, they were quite good at the start of this season, but I prefer Manchester City because I believe that Guardiola always has strategic tactics to face Arteta and his team, winning this match is very important to maintain a safe position even though I know that sometimes Arsenal are in the start of the season always plays well. My prediction is that Manchester City will only win narrowly against Arsenal, but I respect your choice on Arsenal, we'll see later 
As you predicted Manchester City to win, I am also having hope for Arsenal because if Arsenal can not win Manchester City, then they should stop dreaming for Premier League title, and winning this match will give them a chance to also top the group.