So, getting back to the topic, the most important difference is the height of the ball. What most people don't realize is that hitters start their swing to a fixed point they think the ball is going to end up. That fixed point is not moving. Yes a good baseball swing can be long through the hitting zone and account for fractions of timing issues. Both golf and baseball players are trying to contact the ball near the bottom of their swing arcs. Please recognize that I said near, not AT the bottom. Both swings deal with sweet spot control as well as lag, power accumulators, pressure shifts, face angles, swinging from the inside, etc. Many, many similarities.