for me it changes periodically. I sometimes have iPhone spells where I find myself sitting on the couch and using my phone for everything including reading, watching stuff, gaming etc. (another indicator for me personally that I dont need a bigger screen iPhone, hell I can play GTA in my iPhone and feel very well entertained) and then almost try to force myself to go with the more rational choice for all this (my iPad mini).
Other times, currently for example, it's iPad Mini all the way. It's definitely the more intuitive choice for unwinding, I sometimes feel drawn to my Phone because it feels niftier for messaging friends, probably a matter of the size again.
To cut a long story short, it's really 50-50, the only thing I dont use at home (for entertainment) is my Mac. That's strictly work and the media library/hub.