Disc/cartridge. (I prefer having the physical copy of content.)
Hardware might fail, content might be removed from online libraries, DRM policies might change, etc.
With a physical product it's just simpler and sometimes cheaper.
I would agree with that. I just like the concept that I can resell my games to make a generalized profit. And being how quickly games lose value, I usually sell them right away when I'm through with them. Unless it's a game I truly want to keep.