I'm gonna weigh in on the 4k/digital topic.
First, it's 4k or bust imo. Preferences aside, 4K is the better option imo for display and getting the most out of your picture.
Second, 4K physical copies and even standard Blu rays are a better choice over digital. Again, preferences aside, the physical copies will produce both better video and audio quality than digital. That's not an opinion, it's fact. Digital is always improving but the level of quality in blu ray players and their future proofing with software updates creates better quality with output. But like I said, it's still about personal preferences. For me, for example, I am very into picture/audio quality and I can see even slight differences in either to where I want the best possible output. IMO, the only real benefit to digital is for portability (in many cases, I have a digital copy to back up my physical copy if I wanna watch something on the road, etc.) and to help with clutter, for lack of a better word. I guess some people prefer not to have shelves upon shelves dedicated to housing a collection and would rather just have everything on a desktop computer/laptop/phone or whatever. For me though, I enjoy the look of display cases. But objectively speaking, the hard copy format produces a higher level of quality for both picture and audio.
