One of the things I like about CoreData is that all the relationships and entities are defined in one file, and its easier to browse the history of that schema to see how the models evolved. One of the things I dislike though is that it doesn't interop well with swift types and almost everything has to be marked as optional. It looks like this SwiftData solves the second problem, but since definitions are spread across all the classes individually, it's harder to get a glance at the whole schema at once.