Debate; what is the right screen size?

Screen size its just one of those things.  everyone has an opinion, whether its 3.5, 3.7, 4.0, 4.3, 4.5, 4.7 or even 5.3 like the Galaxy Note!  Below is a place for you to debate what screen size you think is the best.  What screen size you have on your phone and what you use the less or more real-estate for? 

Let it begin!