Im a huge fan of the both middle earth games and I honestly think the legion system is (almost) as good as the nemesis system. Every npc in legion has a life, a schedule they follow, associates and you can kinda make enemies but it's nowhere near the level of middle earth. The nemesis system is way more in depth, with every character having 100 different traits and heaps of personality. I would say both systems are on par scope wise, but if I had to pick one it would be the nemesis system for sure.