4K digital copy or Blu-ray?

[Zen_Amako]

With streaming looking like the future, I can see a lot of catalog titles only being made available in 4K UHD via streaming. So here’s my question: given the choice, would you rather own a movie on standard Blu-ray (a physical copy on a disc) or have a UHD digital copy that you can stream on VUDU (or a similar service)?

What made me think about this is that VUDU already has a few films available in UHD that are not on UHD disc, like Sucker Punch and Edge of Tomorrow.