It depends...
If you're aiming tot train 3 SF's at one position al the time, than I would go for a balanced training regime. During normal weeks I'd go for 1 position training OD, ID, IS, PS etc. During the allstar week and PO weeks I'd go for training 1vs1, JS and stamina
But If you like to include players with a different endgoal (different endskills, so not 3 similar SF's) than it might be worthwhile to train outside or inside skills first.
Also if you have a goal set for your team in let's say to promote in a season or 3, it might be handy that you're SF's are a bit better at C than at PG or vice versa. So you won't lose a lot of strength in those games.
Balanced training trains quicker, but a accent on a player here or there might be handy.