Lightbox has reduced their price from $15 per month to $12.99 in reply to Netflix starting in New Zealand. This matches Netflix's Standard Plan price.
Lightbox has more New Zealand content however Netflix has a much bigger catalogue especially when you switch regions. Of course, you can get 12 months of Lightbox for free when you sign up to a Spark broadband.
Try them both out and see what works with you. Competition is great!
Existing Spark broadband customers also qualify for the free 12 months without extending any contract term etc