As for the arguing about the interstate views, well to some they don't appear to matter and to others they do. I guess we'll have to wait and see how it turns out, though the slides do look exciting and to some that may be the most important factor.
For me personally however, I love the 'secluded' feeling that Typhoon Lagoon and Blizzard Beach have by not being right next to a highway. Yes you can see the odd building in the distance from certain points, but you feel far removed enough from civilization to be completely immersed as though on a tropical island. Maybe you'll get this feeling in Volcano Bay on the ground, though I doubt it will feel the same at least not in the same relaxing sort of way?
As for arguing which is going to be the better of the water parks, again it appears to me it will depend on what sort of experience you're looking for as I think they'll be rather different. For those wanting faster, bigger water slides who aren't that bothered about seeing plastic and metal everywhere, then Volcano Bay may win. For those wanting a more serene, immersive and relaxing experience, then the Disney water parks may very well win? It's possible to give both water parks their merits and see they both have a great deal to offer.