Oddly, I am never really satisfied with a 2 hour session or less playing an RPG. I love to tell an epic story and it’s rare that you can get one told in 2 hours or less. But I have done it and still had fun. In most cases, it was done at a convention as a demo for a particular system or a quick arena fight. The “best” system depends on your audience and what you intend to do in those 2 hours, for me. So my answer initially is “Depends!”
