Spike,
You cant compare the two, they are very different. I believe the FAA flight training is more advanced and more functional in todays flying. By the same token I believe the JAR/JAA written subjects can teach you a better basis of how things fly (as well as how they have flown for 100 years, they tend to dwell) If you do not have the legal right to live and work in the U.S. then forget the FAA approach and do it as an add on. Your chances of getting a job in the U.S.with no green card are between No Hope and Bob Hope, and Bob died!
There are "N" reg jobs around and many airlines accept the FAA ATP but most of those are like Cathay and you need 3000+ hrs to get in. You will find it alot easier to get a job with a JAR FATPL than with a FAA COMM as that is all you will have untill you get to 1500hrs and do your ATP test.
Good luck