It's been 16 months since Mikel Arteta replaced Unai Emery at Arsenal and David Moyes filled the vacancy left by Manuel Pellegrini at West Ham.
The Hammers have flourished with Moyes at the helm, going from relegation battlers to genuine top four contenders in the space of just over a year.
Arsenal, on the other hand, are still struggling for consistency under Arteta and could yet record their first bottom-half finish in the Premier League since 1995.
The Emirates and the London Stadium may be separated by just four miles, but the two clubs appear poles apart on the pitch at the moment.
And with that in mind, Daily Star Sport have taken a look at four mistakes Arteta has made which Moyes avoided 16 months' on from their respective appointments.
Reliance on individuals
West Ham are a team performing greater than the sum of their parts. That's not just down to quality players like Declan Rice and Tomas Soucek, but valuing the collective over the individual.
The Hammers act like a team who are all pulling in the same direction – Arsenal do not.
With the Gunners, there's a chronic overreliance on the forward talents of Pierre-Emerick Aubameyang. If the Gabonese hitman isn't firing then his performance tends to translate to the rest of the team.
Arsenal have picked up 18 points from 57 available in the matches where Aubameyang has started but failed to score compared with 14 points from 18 available when he has scored – a telling statistic.
Building blocks in place
Ask any former manager and they'll tell you a successful team needs a solid spine; West Ham have that and Arsenal don't.
Moyes has been able to rely on Lukasz Fabianski, Angelo Ogbonna, Craig Dawson, Soucek and Rice for large parts of the season, and when injuries have arose, able deputies have been found.
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Arteta, by contrast, quite often tinkers with both his central defenders and midfielders, meaning those vital partnerships which are so important to a winning side are simply not in place.
The Spaniard needs to start trusting in certain members of his squad, because as Moyes has shown, having those combinations in key areas is of vital importance.
Style of play
You can't build a house out of play-doh, but that's what it feels Arteta is trying to do at Arsenal.
While the Spaniard's principles deserve respect, there needs to be some acknowledgement that the Gunners just don't have the players to try and play like Manchester City.
Too often this season, Arsenal have been caught out – and paid for – trying to play attractive football.
Moyes knows the limitations of his side and employs a style which gets the best out of them. Maybe it's time for Arteta to start doing the same.
Bukayo Saka, Emile Smith-Rowe, Eddie Nketiah, Joe Willock, Gabriel Martinelli and Reiss Nelson have all received significant game time at one point or another this season.
Arteta deserves heaps of praise for his commitment to youth, but does it say more about Arsenal's performance in the transfer market than anything else?
Should a club of Arsenal's stature really have such a reliance on youngsters, or it just symptomatic of a lack of trust in new signings?
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Moyes has been keen to include youngsters in his squads, too, but it's only Ben Johnson who has really been used consistently at first-team level.
The Scotsman knows the value of including young players – just ask Wayne Rooney – but it's not healthy if they're the ones bailing you out time after time.
For someone like Saka at Arsenal, it's not right that such a precocious young talent is carrying the weight of expectation because more experienced players aren't stepping up to the plate.
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