On a normal day with the current form of arsenal and Chelsea I think it will be very clear who the winner would be on paper but since football is a really crazy sport, I can expect the unexpected because arsenal pulled it up against Manchester city as no one would ever believe that they could win the Manchester city as Manchester city has always been a thorn in their flesh but that's the beauty of football, no one knows truly knows the full outcome till the match is decided.
Yeah as I said before Chelsea and Arsenal are on fire and in high confidence which means both teams can do anything unexpected, I won't say Arsenal can win easily because they defeated Manchester City in the last match because each match has a different moment. Chelsea who began to rise from bad results wanted to continue their wins record moreover it is a home match so the chance is 50:50 imo,