Digital Only is the greatest atrocity of mankind.
Eh. I mostly do it for portable systems. My Xboxes and PlayStations I buy disc only if that's an option, but I like taking my entire library of games with me when I pack a Switch, PS Vita, or PSP Go in my bag, and digital only makes it so I only have to pack the system itself, rather than suss out portable storage for all deez gaems.
For my PS3, PS4, Xbox 360 and One, I buy physical because space considerations are less at the forefront.
And because having a wall of games you can point to and show off is still badass.