As I believe, regardless of what you think of these bond repayments, either scheme will see the cadet paying in full for the training but in different ways, i'd go with OAA/ Parc because of the flexi crew contract.
My personal experience from friends and colleagues were that Parc cadets were in a much more financially stable situation that CTC cadets, with some declaring themselves bankrupt in the last years due to low pay from CTC and high loan repayments.
I am also biased to OAA itself as a school and whilst they are without fault, I can only recommend the high quality training you'll receive there.