Apparently you get 100% miles with Aeroplan, even on E+. If you are a LH member, you could get up to 125% there depending on the booking class.

Given what has been said here, I would definitely go for NZ E+ for such a long trip. Their service looks nice and the pitch is very good, plus: E+ is on the 2nd floor of the 747s which is nice.

If you live in AMS, why not considering the LH or BD program instead? just a thought...