I've never flown NZ in C but I have flown LX in F and I find it hard to believe that
this is a better seat than
this. But choose for yourself.
What are the DC award ticket change fees? If they're small I'd recommend using your DC points for whatever is available now (UA in C/F for ex) and then change your flights at a later date when better flights open up (hopefully LX in C/F).