Both are excellent. You will find many people will tell you to choose the WL because it is close to the MK. If that makes a big difference to you than choose accordingly. The trip from AKL to MK is not that much longer (the bus goes much faster than a boat). In any case you should choose which one appeals to you the most. They have similar sized rooms and the decor in both is good though I like AKL room decore better. I like the restaurants better at AKL but since you are only there one day, that probably doesn't matter.