Ed which edition do you play? Depends on who I'm playing with and why (playtest, or for pleasure?). I "think" in 2e, which I had the largest hand in designing/spent longest working in. I sometimes run 3e. These days, a lot of 5e.
But most often, edition-less, rules-light "DM=storyteller, players=actors" style
— Ed Greenwood (@TheEdVerse) January 29, 2020