This question can be answered by going back through this blog, but if you don’t want to do that: D&D, 5th edition. I’ve been running a Spelljammer campaign that’s coming up on it’s 26th fortnightly session. It’s taken longer than a year to get to 26 sessions, due to canceled games and hiatuses to play test convention-bound one-shots. I started the Spelljammer game in January of 2016, but it’s really a continuation of the 5th edition Hoard of the Dragon Queen campaign I ran from November 2014 to June 2015. I think it’s fair to say now that 5th edition is my favorite edition of D&D. I wasn’t able to say that about 4th edition or Pathfinder (the shine had worn off d20/3.X by the time the 3.5 revision of D&D was released).
I anticipate the Spelljammer game coming to a conclusion by the 30th session at the latest. No one knows what comes after that; we haven’t decided. Probably a smattering of other games to cleanse our palates before I launch another D&D campaign.