AKV is cheaper direct than Poly. However, I think it comes down to where would you be more happy. I will spend more to get a resort I want to be at.
I would never buy a resort that isn't a top choice if I am stuck, unless it is in addition to points I own at a place I am good. I own 500 SSR points to use as SAP to upgrade to 1 bedrooms if need be. But, I own RIV to stay there and use home resort advantage...as well as hope next year to add back on VGF points for 11 month advantage there.
If both are on your list, then I say go with the less expensive one.