Federal loans are definately the best route you can take, they have the lowest interest, however they are only available for a Title 4 schools and not if you are just getting training at an FBO. If you are going to a university/college and already have federal loans, try the Wells fargo collegiate loan.
https://www.wellsfargo.com/student/u...ad/collegiate/

The interest is the lowest of all of the private loans out there and they will finance you for flight training costs if you are in an aviation degree program. Hope this helps.