I'm my opinion none of them are, I used to think some of them wasn't to bad, that was until last season when after some useful advice from a association member I started buying fast trainers only for my 1st team from the auction list and the difference in training from the youth academy to the auction list fast trainers is vast. I've stopped taking players from the academy for my 1st team unless I have given them all the coach awards from special sponser, the other youth academy I just get to sell so I have money for the transfer market. If you don't have alot of tokens then you can make it work with youth players but it takes alot of greens. Another thing that was pointed out to me was the youth academy players who are 58% or below seem to be slightly quicker to train than the ones over 58%. (other people may have different opinions and experiences, I'm not saying mines right but that's how it's worked out for me)