VB Don't pay you during the actual endorsement phase, but they do pay you during the induction phase, line training etc - all at full pay.
QF pay you at PUIT wages during your training, and then you are still on reduced wages for 2 years (as I understand it - if anyone would like to give a proper explanation I would be most obliged)
Either way YOU pay for it one way or another.
With the Virgin method, you are under no obligation or financial duress to stay if you find something better. I am not sure if QF bond people, but many operators do, and in some cases it is quite a lot of money.
What I don't agree with is what some O/S carriers do, and that is to bond people who are already endorsed - but that is a different discussion.