This is a harder question to answer now than a year ago. A year ago the answer was the Pathfinder RPG, and Pathfinder still has the finest organized play I’ve ever encountered (and helped run, as Venture-Captain). But a year ago D&D 5th edition didn’t exist, and I hadn’t give the AGE system a closer look. But the newest iteration of D&D looks great, especially as I see it being played on Geek & Sundry’s Critical Role. Also from G&S, Titansgrave: The Ashes of Valkana has shown me how simple and fun the AGE system from Green Ronin can be.
So let me say this. While I still love Pathfinder, and it’s still my current favourite, I think there may come a time when we part amicably as far as my home games go. Pathfinder could (rightfully) take me task for only using it to get through the Dark Times when D&D, frankly, sucked. But we had some good times and truly great moments, Pathfinder and I, and I regret nothing. D&D has gotten back to its old self, maybe even better than it once was. It was my first love, so I’d be foolish not to give it a chance.
I do still love the world of Golarion, though, so a lot of my D&D or AGE adventures may continue to happen there. Who knows?