5. At the moment, #CallOfCthulhu is the #TTRPG I play the most—it accounts for over a quarter of my hours at the table, and I currently play in two weekly campaigns, as well as frequent one-shots.
Since I began roleplaying, though, it'd be #DnD, though which edition I've played most is an open question: #BECMI, #ADnD1, #ADnD2, or #DnD3e. (I've not played nearly as much 0e, 4e, or 5e, though.) #gtkm