I'm not an expert, and this is what I learned so far:
the NAA is the certfificate issued in the countries that are not issuing a FAA yet (for instance, in Europe only 3 or 4 countries have FAA), it will come but for now it stays a certificate and not a licence. The same path of learning and same examination, but some burocratic matters in between. Opportunities are all down to how fussy is an employer, but the person with a NAA has gone throught the same training.
FD is probably the only career one with no aviation experience can take, in less than 2 months one is qualified with most of the ATPL theoretical knowledge and can start looking for jobs without further specialization.
Again, i'm no expert so I might say something wrong.