Used to use Marathon Plus, but then found Vittoria Hypers felt so much better and didn't flat all that much more. I'm also a heavier rider, but I guess I'm good at avoiding the sharp debris.
Now I'm using Almotions, which are pretty good. They probably are closer to Marathon Plusses than they are to the Hypers, in terms of casing feel, but I can run them tubeless, which helps make up for it. In a 26x2.15 tubeless, I haven't found anything else that tempts me as I want to keep the tread minimal. I'm on the lookout, though, because I do think they could be a little more supple. Not sure that flat-protection band is doing me a whole lot of favors, especially when tubeless.