13/14 - David Moyes (until 22 April 2014)
League position (when Moyes was sacked): 7th
Points (when Moyes was sacked): 57 (1,67 points per game)
Goals scored (when Moyes was sacked): 56 (1,64 goals per game)
Goals conceded (when Moyes was sacked): 40 (1,17 goals per game)
FA Cup: 3rd round (lost 2-1 at home to Swansea)
League Cup: Semi-final (lost to Sunderland on penalties)
Champions League: Quarter-final
14/15 - Louis van Gaal
League position: 4th
Points: 70 (1,84 points per game)
Goals scored: 62 (1,63 goals per game)
Goals conceded: 37 (0,97 goals per game)
FA Cup: Quarter-final (lost 2-1 at home to Arsenal)
League Cup: 2nd round (lost 4-0 away at MK Dons)
15/16 - Louis van Gaal
League position: 5th
Points: 66 (1,73 points per game)
Goals scored: 49 (1,28 goals per game)
Goals conceded: 35 (0,92 goals per game)
FA Cup: WINNERS
League Cup: 4th round (lost at home to Middlesbrough on penalties)
Champions League: Group stage
Europa League: Round of 16 (lost 3-1 on aggregate to Liverpool)
Van Gaal overall did better, but I personally feel much more underwhelmed with what he did compared to Moyes. Most knew that Moyes didn't have the level required to be the manager of Manchester United, while Van Gaal with his CV should be able to do much better than Moyes, which he didn't do imo., and that's also why he got the sack.