Hmmnn, my old Iwata hakama is at least 7 years old and is just now wearing at the knees. I love that hakama, and don't wear my poly blend much at all (unless it is really hot). The indigo hakamas are very durable and last a long time. While they are expensive, sometimes you can pick up a good used one quite cheap.
What you prefer, is of course a personal preference.
Best wishes on this Marty