Out of all of the games that I have played, Apocalypse World tied with Mutants and Masterminds 3e are by far my favorite systems to play (2nd is nWoD tied with Shadowrun 4th). My only request for it is to allow the Heralds of Hell playbook (specifically the Haunted playbook). Stars Without Number is by far my favorite system to gm.
As of currently, I am constantly looking for a M&M3e campaign or a shadowrun 5th campaign that is run either weekly or every other week.