which men of war is best men of war

man of war

Men of War Assault Squad

It depends on what kind of game you're looking for. Broadly speaking and without details involved, it would be the following:

Men of War: Assault Squad = Multiplayer
Men of War / Men of War: Red Tide = Single player campaing
Men of War: Vietnam: Single player with commandos feeling.

Commandos feeling because the MoW: Vietnam have a different approach from the previous, with mostly "black ops rambo" style of missions, with small squads advancing, different from the original series with basically batallions. And if you're looking for a multiplayer game, Assault Squad, however don't expect it to have good single player content.

the lack of an active pause makes it pretty messy when you have to control more than half a dozen units, so i prefer the "commandos" type campaigns of the original MoW and MoW:Vietnam.

Red Tide has just way too many huge battles with hundreds of units you can't manage properly... and personally i don't like at all the multiplayer version (Assault Squad), but i'm not that much into RTS PVP so...