My order of preference is:
1. Digital - So many benefits, such as security (no worrying about my games getting stolen), convenience of having all of my games easily accessible, and laziness of not having to get up to switch games. I very rarely traded in games or sold them, so the main negatives of digital don't really apply to me...well, outside of the rare game being delisted, which hasn't affected me yet, but will most likely get me one day.
2. Subscription - Xbox Game Pass won me over; it has been great having access to a ton of games that I would normally never consider, mixed with some bigger hits. Downside is that it seems pretty common for games to be removed from the service.
3. Streaming - I don't think I've streamed any games yet, but I like the concept. Not sure if I will jump into Stadia since I am currently already close to my Comcast cap every month, but I'm interested in seeing where it goes.
4. Physical - As mentioned, I don't trade/sell games so physical just doesn't interest me at all. Plus I remember all the space I wasted years ago storing tons of games, and losing a bunch in a burglary making me need to repurchase many of them...no thanks.