Anyone that has ever done anything practical with electronics (ie. engs) has always used conventional (hole) flow it seems to me because that's what everyone in industry uses, and all the datasheets, etc, etc. Seems like the matter of theory vs what's used in practice. If you reverse your thinking, you will trip up sooner or later and not know it.
I first tried to reverse everything to electron flow since that logically made more sense, but I realized quickly that I would trip up sooner or later since everyone else was using the opposite. It's two paths: more logical at the start but requires effort throughout your life, or just learn the reverse way like everyone else at the start and not have to make an effort reversing everything as you go.