Knowing the best growth type is only half the battle. Your training and match play heavily influence how that growth type plays out.

Younger players (17-21) gain the most from training and match experience.

Players with roles like "Youth Prospect" or "Protege" provide massive experience point (EXP) bonuses to themselves and teammates in the same position.

Early/Lasting is widely considered the best because you get a superstar almost immediately who stays elite for nearly a decade. How to Boost Growth