This. Whichever program helps him develop his best time/technique is the best choice. Coaches prefer strong, experienced rowers regardless of whether their background is in high school or club rowing, and they keep an eye on those who perform well in a competition like the Crash B’s where it’s all about time, they don’t care how you got there.
TIP: They also prefer those over 6’3”, so he should choose the program that will best increase his height. 