They offer fundamentality different experiences so I'm not sure we should be grouping them together as much as we do. It's like saying "It seems like cars are a lot more practical than boats" - but they're intended for different things.

There might be some cross over in some of the technology, and how you consume it, and the end game may be AR eyewear/contacts that can do proper virtual reality, but for now - they're quite far apart from each other.