AKL is all in one building, we stayed there 2 years ago and our room was at the far end of the circle / horse shoe whatever you want to call it. It is quite a hike from the busses to the far end. I've never stayed @ Poly (but will in Oct.), I know there are more buildings and may be larger/more spread out, but with less rooms.
Depends on what your version of bigger means. Poly has larger rooms but has various buildings spread out over land without covered walkways inbetween. AKL has slightly smaller rooms and is built in a big horseshoe but is an all interior hotel which will have a longer walk if your placed in a room further out.
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