So is RoR something like Flask[0] which provides you with basics and all other bells and whistles (e.g. ORM, Forms, Admin, Auth, etc..) are available via extensions?
Rails and Django are equivalent to each other from the sense of providing an MVC based framework to build a web application.
Rails has session management, forms, ORM, and simple authentication all built in (as well as asset compilation, schema migrations, websockets, asynchronous processing, file uploads, etc). Models do not contain schema definitions, they're defined elsewhere. Admin functionality needs to be added.
I've got some experience in Python at this point if I were to build a new CRUDy business app I would use Rails because of my familiarity with Ruby and Rails. If I wanted to learn more Python as a main goal I'd pick Django.