I have 3 trainees and I get them all 48mins a week..... And I found my team got better at a faster rate when I did 1 pos training than 2 pos, you can train a player up faster and either sell him for a big profit or he reaches his cap faster and you get a new trainee and a good player on your team... Easy as!
I think most NZ teams train an NZ player but not all, there are a limited number of good NZ players to train and sometimes they go to a higher bidder overseas.
Best players? Not talking about that in a public forum, are you a spy? ;)