I have both and I use them for different things! The hemp is nice because it is trim and absorbent. But, I find it to be a little stiff and square, while the micro-terry isn't. Micro-terry is also quite absorbent and is better at absorbing quickly. Some people don't like washing micro-terry because everything sticks to it in the dryer, and it feels weird on your hands if they are dry.
I have to say that if I could get new FB for 10 dollars more, I would go for that one. Just me though...
HTH a little.