Either 3-4-2-1 or 3-4-1-2 can go against 4-4-2 classic. It's better if you have AMCs with Shadow Striker SA. If you do, put UP arrow on him. If you defenders have high speed attribute, play offside trap because you have only 3 DCs.
If using 3-4-1-2, then attack with mixed focus passing. If 3-4-2-1, then attack through the middle. Your squad must fit the formation as well, you just can't force your players to play any type of formation.