We haven't stayed at WL, but have stayed at AKL and would stay there again, no problem. Especially with a savannah view. I can't begin to describe how great it was to grab a cup of coffee in the morning and go out on the balcony and watch the giraffes stroll majestically along, and listen to the male elands click. The pool is also great, and the pool bar serves my favourite beer in the world, Safari Amber. Also, you're real handy to Boma.
In spite of the relative isolation of AKL, we found the bus service to be extremely efficient, and never had trouble getting anywhere in a timely fashion.