youth academy gives you a fresh player with 3s across the board. The higher the investment, the younger the player. (13-18)
Your actual team is 20 yrs old, so they will play for 5 season.
scounting gives you a "random" player. It used to be kicked ones, but the pool is now mixed with some random ones.
The more money you invested over the last 30 days, the better the player you can get here.
hope that does the trick