Jose Mourinho is almost at the end of his debut season as Manchester United manager, with one Premier League game and the Europa League final to come.ResultsMoyes: At the end of Moyes’ only season in charge at Old Trafford, United finished seventh – the lowest they have been since Alex Ferguson’s departure. They won 19 Premier League games – though the Scot only led them to 17 wins from 34 before he was replaced by Ryan Giggs. The only silverware he claimed was the Community Shield, though even winning this underwhelming bauble was somewhat diminished considering United only beat Wigan to claim it.Van Gaal: The Dutchman led United to fourth place in his first season at Old Trafford, winning 20 league games – the highest figure since Ferguson’s retirement – but could only follow that by finishing fifth in his second year. They won 19 matches in 2015/16, but Van Gaal did lead the Red Devils to victory in the FA Cup.Mourinho: Even if United beat Crystal Palace on Sunday, Mourinho would have claimed only 18 wins this season – which will be the Red Devils’ lowest ever win total in the Premier League era. However, they have lost only five games (six if Palace win), which included a 25-game, top flight club record, unbeaten run. Under the Portuguese, United have won the Community Shield, the EFL Cup and are in the final of the Europa League.Verdict: Despite winning less league games than Moyes or Van Gaal, and finishing sixth, Mourinho has arguably the best record as United boss. They have already won one major honour under him, and if they claim the Europa League, the Red Devils would have won more trophies this season than they have altogether since Ferguson left. They will also qualify for the Champions League group stage, which would undoubtedly make him the biggest post-Fergie success in terms of results.Style of playMoyes: Moyes’ big mistake was trying to turn then-reigning champions United into Everton, rather than playing to their strengths. Though he fielded a classic 4-4-2, with two strikers and two wingers – as in the early Ferguson days – Moyes did not adhere to the ‘United way’ of swashbuckling, attacking football. The play was lacking in fluidity, was overly cautious and one-dimensional, and resulted in that famous ’81 crosses’ game against Fulham.Van Gaal: Fans expected ‘total football’ when LvG arrived at Old Trafford, but were treated to a defensive, low-tempo style of play which got progressively more sterile over the course of the Dutchman’s two seasons with United. They conceded fewer goals than Moyes’ United did, but scored fewer too; the nadir was netting just 49 Premier League goals in 2015/16. Van Gaal’s teams seemed obsessed with passing for the sake of it, knocking the ball about to no great effect as opponents sat back in comfort.Mourinho: There has been undoubted improvement in United’s style of play since Mourinho took charge, though the bar was set so low that is no real compliment. Scoring goals has been a continued problem for the Red Devils – just 52 netted in the league – though that is more down to bad finishing than a lack of attacking play. However, Mourinho has fielded very defensive line ups against the big clubs, and – like his predecessorts – he has faced criticism for what is regarded as a very un-Man United way of playing.Verdict: Again, Mourinho just about wins. United’s football has been incredibly dour since Ferguson left, but the Portuguese has at least brought back a feeling that a visit to Old Trafford will be a tough test. His United go on the front foot against lesser opponents, but have often been denied by bad finishing, excellent goalkeeping, and the woodwork. Performances against United’s main rivals have not been great, as Mourinho remains true to his cagey form against the big guns, and one would hope he changes in future seasons as Red Devils boss. Don’t bet on it, though.Transfers and spendingMoyes: Moyes was given a poor hand in the transfer market when appointed United boss. David Gill stepped down at the same time as Ferguson, with Ed Woodward stepping into the role of overseeing transfers despite having zero experience in that field. The club failed to sign Ander Herrera, and only brought in Marouane Fellaini in the summer – for more than his release clause. Juan Mata was added in January. Both players did not show their best under Moyes, but have been good servants for the club. In all, Moyes spent £64m – much less than either Van Gaal or Mourinho.Van Gaal: Following Van Gaal’s arrival, there was a concerted effort to seriously improve the United first-team squad. Herrera was finally signed, along with Luke Shaw, Marcos Rojo, Angel Di Maria, Daley Blind, Tim Fosu-Mensah and Victor Valdes for a combined £146m. Memphis Depay, Matteo Darmian, Bastian Schweinsteiger, Morgan Schneiderlin, Sergio Romero and Anthony Martial were added the following year, with another £125 million splashed out. He spent a lot, and certainly didn’t improve things enough to suggest it was money well spent.Mourinho: Like Van Gaal, Mourinho was given free rein to purchase who he wanted for the price he wanted, and the Portuguese took advantage of that. Paul Pogba, Henrikh Mkhitaryan and Eric Bailly were brought in for £157m, with Zlatan Ibrahimovic added on a free. Bailly has been a roaring success and is young enough to provide top class service to United for the next decade, Ibrahimovic scored for fun before his injury and Mkhitaryan has enjoyed a fairly impressive season after a slow start. Pogba has struggled to live up to his price tag, and still seems to be finding his feet, but it would be wrong to write him off after one season. Like Van Gaal, Mourinho should be criticised for the lack of improvement made by his team despite the money spent on it.Verdict: Moyes certainly got the most bang for his buck at Old Trafford, having been handed little chance to raid the transfer market. Almost half-a-billion pounds has been spent on the United squad since Moyes left, and they have moved from 64 points in his season to a potential total of 69 this term. Five points is not worth that much money, and it is fair to say Moyes got a raw deal. Mourinho really needs to ensure he doesn’t spend every summer throwing cash at the problems he has to fix, as both he and Van Gaal have shown it doesn’t work.Overall verdictMourinho is doing just enough to elevate his reign above that of Moyes and Van Gaal, but the jury is still out. The Europa League final could be absolutely pivotal to his tenure. 1 Moyes v Van Gaal v Mourinho: Just who was better?