Hey There,
I am racing the PN series this year and it's been a blast! With so many combined events with the NMA series it makes it pretty easy to qualify in the PN series.
We've raced Herling Island (a fast fun event), Vancouver Island, Coalmont, Chilliwack, Lytton (always a favorite) and we are planning on racing the event in Kamloops.
We really like that the terrain, tends to be challenging (steep) and in great shape. The people are great and the events are pretty well organized.
All in all I'd say I'd rather race the PN series the the NMA series.
My 2 ¢