Ok, I've played both.
Poipu Bay:
Fair
Enjoyable
Picturesque beyond belief
Comfortable
Extremely playable
Princeville:
Awkward
Daunting first hole
Numerous unfair holes
Minimal views
Mediocre experience at best
The two courses are so diametrically opposed it's not even funny. I know I am being a bit harsh, but I seriously couldn't stand Princeville. Whereas Poipu was one of the best golfing experiences I've ever had. I even played it twice.
I don't know if the price of the two is a factor. I was on my honeymoon and money was not an object (for those 2 weeks anyway

). I seem to remember Princeville being more $$$.
If you want to talk more about the courses I can be more specific if you want, just PM me!
Dormie