The Observer's football correspondent Rory Smith has been pitting Michael Carrick and Andoni Iraola, who have both been linked with Manchester United’s permanent managerial job, against each other on BBC Radio 5 Live’s Monday Night Club.
Either way, he believes the Red Devils' football executives will have a "really difficult" decision to make this summer, when it comes to appointing their next manager.
"The football executives will have to weigh up three years of Iraola at Bournemouth in the Premier League against sticking with Carrick,” Smith said.
"Iraola has played wonderful football throughout, brought through talented players like Milos Kerkez and Eli Junior Kroupi. Iraola has become a cog in the machine, and definitely improved the club.
"They are all big ticks, but the club will have to work out if he can take his style of play and training methods to get the best out of players who won't just be playing once a week.
"Or do they stick with Carrick, who has a much smaller sample size, he hasn't done all the things Iraola has done, but knows the club well, the fans and the connection to history.
"It is a really difficult decision to make, and too often we treat it as if it is obvious or easy."
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Watch the full episode on BBC iPlayer and listen on BBC Sounds
