I personally like ID on the shorter players, definitely could go 1v1 /OD too, but right now on my SF trainee in utopia I've finally switched to 1v1 and I have his ID already at a pretty high level.
Training ID first means that now you won't have to do it as much when he gets older, so I'm a big fan of ID, then 1v1, OD, and then back to ID again if you so desire.
3 Time NBBA Champion. Certified Trainer. Mentor. Have any questions? Feel free to shoot me a BB-Mail!