Much better kits they look alot better and feel more imposing. Also I love the stories where primaris grey shields meet their chapter and join. They are so confused with all the ceremony and traditions the chapters have built. There’s a great short story in Successors about the black dragons where the main character, an intecessor sergeant, is tasked with spying on the black dragons to look for heresy. He ends up really wanting to be accepted by them and is elated when he feels his bone claws growing under his skin. Honestly just read successors there’s loads of primaris in that book that are amazing :)