Most right side (ejection side) stocks/braces are designed to clear the charging handle. I think right handed works best for right handed people. With the weapon slung in a way that the weapon is held at mid to low chest level against the body the stock can be quickly deployed close to the body. If it were a left handed stock the weapon would have to be moved out away from the body so the stock could be folded out. Not a big difference, and really all on how you train with you weapon and develop muscle memory.