I believe both the Xbox One and the PS4 will be great consoles for the next gen. However the Previews here on Mighty Ape contain large amounts of unsubstantiated opinions and incorrect information about both consoles. So my advice – be wary and do your own research!
Both consoles are very similar to one another and I doubt you will see much graphical difference in quality between them and, if you do, it won't be evident until late in the life cycle of these consoles. If you are evenly slightly interested in motion and voice controls, then Xbox is the way to go with Kinect 2.0. On the other hand the PS4 comes in slightly cheaper (due to a lack of bundled PS Eye) so if price is relevant then this might be your deciding factor. If you're into online gaming, Xbox have been the front-runner in the past and have offered dedicated servers to developers through the Microsoft Azure cloud. But PS4 will be right on their heels with Gaikai.
Overall, I might come down to the games you prefer. Many games from many publishers will be multi-plat so (again) both consoles will be great! But each console will have its exclusives. Be wary of the Previews on here and go out and do your own research about the consoles and their exclusive games. Figure out which games and features suit you best! I truly believe both consoles will be successful.
November / December can't come soon enough! Happy gaming New Zealand!