where is better to take nclex? HK or Saipan?

If you have a choice.. I would say HK. Airfare (esp. now w/ budget airlines going there) and accommodations are more affordable because it's a tourist destination plus of course you can have a short vacation afterwards.

Unfortunately, because of those same reasons it is quite hard to make an appointment there since slots are almost always full for at least 2-3 months but not impossible if you are vigilant on finding a slot, esp. if you have a dedicated internet service.

Pls. refer to our diff. threads about taking NCLEX in HK here for more details.
Those threads discusses that route quite extensively. Happy reading.