If those results are right, advanced (4) is the way to go. I believe those numbers are too broad to really clarify the differences between levels of trainers though. They wouldn't take into account elastic effect, cross trainings or age.
Rumor is that higher level trainers are shown to be more efficient as the players age.
I managed to pick up a cheap 30k exceptional (6) for 100k, so ill upload some trainer 6 results for future comparison.
Manager of the Bahamas National Team!