Arsenal should win this game when they find Chelsea struggling. Manchester City win was a huge morale boost for them but international break interrupted the focus, that may affect their motivation. It would be nice to win at Stamford Bridge, draw is also not a bad result but we don't see any draw between these two teams lately. There was no draw in last nine games, nobody is satisfied with a draw. Arsenal beat Chelsea 4 games in a row, let's make it to 5.
Arsenal has been on the right since the start of this season winning at every match which has been a motivation to their form moat especially the win they whisk away from the EPL defending champion's Manchester City. They have been consistent with their winning streaks as a result of their performance but like you said international break has a way of affecting team's performance and I won't be surprised seeing arsenal not winning the match against Chelsea in today's game not forgetting that Chelsea isn't an easy opponent to beat seeing how they have started rising to the bar by winning their three consecutive games it is possible they might add arsenal as the fourth consecutive win this season.
Arsenal have a champions league match against the Spanish side Sevilla just a few days from today and the outcome of that game matters a great deal to the gunners to survive their group which means there's a high probability Artheta may not be fielding his full house in the game against Chelsea in full preparation to secure a victory in their Tuesday's game against Sevilla in the UCL. So am very well watching out for a draw in the match against Arsenal vs Chelsea or a win in favour of the blues.