Exceptional trainer is very very expensive, and gets you about 1 week extra training compared to superior.
Is there any estimates how extra will world-renowned trainer give compared to exceptional trainer?
In my opinion, unless you have tons of money, or unless you want to train a player for the national team, advanced is the way to go.
And what if you have 8M in your bank? Do you say it's a good investment buying a world-renowned trainer if someone has that amount of cash? And again, is the word "NT" crucial for buying trainer above superior level?
P.S. I've read somewhere that exceptional trainer isn't sufficient enough for the SF trainers (and I'm not talking about creating player with tremendous in the primary, prolific in the secondary and proficient in the tertiary skills). Is this true?