I have been a Dungeon Master from AD&D - 5E and experienced the spectrum of other games as well. My experience as a game master includes campaigns using the following systems: All Flesh Must Be Eaten, Call of Cthulhu, Deadlands, D&D, GURPS, King Arthur Pendragon, Pathfinder, Shadowrun, Star Wars (Edge of the Empire), Traveller (Mongoose), Warhammer 40k (Dark Heresy, Only War), World of Darkness (either version) and a bit of this and that.
I have no interest in playing paid games.