One of my friends graduated from NTTF recently and according to him, if you don't have any government job aspirations then you can go with NTTF.
This is because NTTF doesn't have AICTE approval and you won't be able to apply for government sector jobs. However after diploma chances of getting a job easy than a bachelor that is the only point.
Since you are getting a diploma from NTTF along with a B. Voc Degree from a reputed college together B. Voc degree is government approved and makes you eligible for government jobs and you will be learning practical oriented skills at NTTF.