I would second the choice of airline prep. I owe both of my flying jobs to their course.
I did the group prep and it was good to learn from others mistakes, but 1:1 will be, obviously, ALL about you.
There is someone on here that is part of airline prep, give it a few days and they might comment.
If you give them a call they are really honest and will give pro's/ con's for group or 1:1.