In todays tennis game we cannot get away with hitting everything from one stance. Most modern forehands are hit with a semi open or open stance. There might be a need to step into the ball, or move up into the court and this might be where a closed stance would be better suited for you.
To sum it up, you need to be able to hit all three stances when the need arises. In this video I will show you what these three stances are and it may help you decide which stance is best suited for your game.