Pathfinder I would play as well as be the GM but the story would evolve around the choices you make, not my character. In addition, you would only be able to control your own character. I would control all npc's. One person storyline I wouldn't play a character but control the world and the storyline would be a bit more fixed. You can't control npc's in this one either. It's like... "I make the world and you play one character in it." The only big difference is pathfinder is a hidden stat system and one person storyline is like a sandbox Roleplay.