VGKing on 28 February 2013
DVR lets you record shows that you may have missed for a monthly fee.
Xbox Video/Amazon Video/Similar Services just allow you to buy these episodes. If you only watch a few TV shows, I guess it would be cheaper than cable, but if you watch like a dozen shows it ends up being way too expensive and you would have to pay for each episodes of your favorite TV shows. So does it replace your cable or DVR? It could, but it would be way more expensive and you wouldn't be able to watch these shows live as they air, you have to wait until they become available on the service.
