It depends on what players you have, and what you get in the draft next week. If you can get 5 18yo trainees with allstar+ potential together then 2 position training has still got to be the way to go.
2 position training is not a lot slower than 1 position, and training 5-6 compared to 1-2 will allow you improve players you want to keep and train some for sale later on.
However, I know the price of half decent young players isn't exactly cheap anymore, and a new team probably wouldn't be able to afford to buy more than 1 or 2 right away.
My advice would be to see what you get in the draft, and maybe check the transfer market in the week after it. It's possible prices will come down a lot for the average 18yo.