It depends....
You need to be very careful with bonds and training costs. My current company i fly for bonds me for £15k, this bond is not with a bank but is a signed agreement with the company. Therefore if i was made redundant i would not have to pay. My last company set up a bonding agreement with a bank, so if i left, the agreement was nothing to do with my employer, simply an agreement with the bank. This way meant that it appeared as debt when it came to getting a mortgage etc.
THe last way is paying for your rating upfront. This is the easiest for the airline, since if you leave or are made redundant you have already paid up so you will get nothing. Risky big time. The best situation is of course the one at the top, but you will not find many like that around, and certainly not as a first job!
Hope this helps