United are still in the battle for top 4 and will push for a win in this game. But they still have huge problems in attack and we saw it in the last game against the outsider Aston Villa, where won only with 1-0. Meanwhile, Palace are in good form after 3 draws and 1 win from the last 4 games in the Premier League, so I expect a tough and under 2.5 game.
Yes, although Crystal Palace are languishing at 16th spot, nobody expects Manchester United to score heavily against them.
Under 2.5 goals is a good bet to go for in this game.