Not Ten Hag and his players, but I think Manchester City is the strongest competitor for Arsenal and in fact, Manchester City has a better chance of winning the Premier League title now that Guardiola has taken over the team and the improvements they have made. In the past few years since Guardiola has joined this team, they have won the premier league on several occasions and they can win it again in the near future.
There's numerous managers that pull a big threat for Mikel Arteta, not only Pep Guardiola. The gunners did an amazing job by portraying a competitive race against the cityzens. Let's say, Gunners ran out of luck towards ending of the league campaign, they started with an impressive start, and not ending lifting the title is something that baffles both the coach, the players and leaving the supporters hope and chant shattered. However they could always returned back to the league with more additional performance, Mikel Arteta is using this time to fixed the weak spots on his squad.
The Arsenal team played well last season. And Mikel Arteta played an important role behind it. His match technique was outstanding. At the same time, Mikel Arteta was able to strengthen the bond between the players. This is why Arsenal's performance was stable. But at the end of the season, Arsenal team lost truck due to injuries of several players. This is why Arsenal failed to win the title. Mikel Arteta must try to stabilize the team. At the same time, the squad should also be strengthened by adding more experienced players to the team. Arsenal also need to tighten up the defense a bit.