If you're team could really use and benefit from a particular SA then I think it makes sense to get that first and early for a Youngster. The 'loss' of SP becomes less significant as he progress through the stars and that SA might bring more to the team than improved individual skills. If you don't choose right tho' then its a loss.

To SA or not can be 'ftw' or 'fail' depending on the circumstances imo.