My son and I both played D1. I would say the numbers were bigger in high school. But we were better hitters in college. A big difference was my father didn’t help me at all despite playing college baseball. For me, high school was “see the ball, hit it.” I didn’t learn how to hit until college. I didn’t learn how to make adjustments until college. I didn’t need to make adjustments in high school. Starting 0-16 with 7 whiffs was a wake up call after dominating high school. I was starting to think I should have stuck with pitching.
I taught my son a lot about hitting. By the time he was twelve he could have an intelligent conversation about any part of swing mechanics. He scared away a LL all star coach who tried to change his swing. In high school he could be crushing the ball and feel something about his swing wasn’t right and ask for video.
Neither of us started when college freshman season started. But we were getting in games. I wasn’t a starter until soph year. He was starting by mid freshman year.
A big difference in high school and summer ball was I had adult supervision for coaches. The players carried the coaches. My son had exceptional coaching in high school and travel. In college I had to be taught how to adjust. He knew how to adjust.
From a results standpoint we were both .400+ in high school and low .300+ in college. We hit for power in high school and hit mistakes out in college.
A big difference between my college experience and his was the emphasis on physical development. I was in good shape. He was a ripped, physical specimen. In high school I hated working out. I only did it for football. For him, working out was part of every sport. I didn’t have any special training. He did FASST (fitness, agility, speed, strength training). I was 6’1” 180 in high school and 185 in college. My son was 6’1” 175 in high school and 6’2” 195 in college.
To sum up, the numbers were bigger in high school. But we were better players in college. Due to the way development and coaching has changed my son was far more prepared for college ball.