Thanks for asking! Both consoles deliver next-generation capabilities powered by the Xbox Velocity Architecture, such as faster loading, the ability to seamlessly switch between multiple games with Quick Resume, richer and more dynamic worlds, and frame rates up to 120fps.
The primary difference between the two consoles is that the Xbox Series X displays games at native 4K, comes equipped with a UHD Blu-ray Disc player, and 1TB of custom SSD storage. Xbox Series S is designed for disc-free gaming at 1440p (with the ability to upscale to 4K), with a custom 512GB SSD. And, of course, they're priced differently. Both consoles have the option to expand available custom storage via the Seagate Storage Expansion Card.