Physical!!! I am not an artist and thus do not understand what it implies, where art quality is concerned, to produce a physical copy of a comic.
However, some of my tenderest memories go back to childhood, when you open a comic for the first time. The crisp sound of the binding that cracks a bit, the feel of glazed paper under your fingers, the chemical smell of that special ink used for comics. Just thinking about it gives me shivers.
I feel that a physical copy speaks to so many senses at once. It is not only visually pleasing and intellectually stimulating. There is smell, touch and hearing that all come together to give the reader a special experience.
But I do also understand that for artists (though, I am not sure, following the advent of the Chinese webcomic and the treatment of Chinese artists by publishing companies - I am thinking of two Chinese artists in particular that broke through the stereotype that Chinese webcomics are supremely mediocre and that got crushed by their publishers), it may be easier to stay digital. More control over production, over finishing, over platform, less dependency on technical specialists and hopefully, very, very hopefully (though I more and more doubt it) more income.