WY,
I understand your frustration. My son is going through the same thing right now. When he started taking instruction 2-3 years ago, everyone was teaching the linear swing - billing it as the new way and a more contact swing for a better avg. His new instructor, a local college coach that is making waves of success, insists that college coaches are looking for power hitters that have high slugging percentages. He insists that the power rotational swing is best. I have to agree with the new coach - I was taught a rotational swing and always had doubts when the the linear was introduced to him. His BA was good while using it, but he just didn't seem comfortable swing out of the inverted "V" - he seemed jammed up. He is hitting the ball much harder now, but we haven't seen any game results yet. I agree with TR that didn't people have different results, you have to decide which fits you best.