Similar to PS5, while you can't store Series X|S games on it, you can store all of your Xbox One games, freeing up precious internal SSD storage space!
You would be surprised at how much you can improve your Xbox experience with a quality headset. OUR PICK: STEELSERIES ARCTIS 3
Xbox is known for stylish and customizable controllers, so grab a pre-designed one or you can even opt for Xbox's recently re-opened Design Lab.
I'm a fan of the AA batteries for Xbox controllers, but if you're more of a "charging" type, pick up a rechargeable battery pack for your controllers!
Probably the best deal in all of gaming, for $14.99 per month you get hundreds of games on both console and PC, online console gaming, plus free games every month and Xbox's new cloud gaming service. Can't beat it.
I know this is a stretch as an "accessory" but to get the most out of the Xbox experience you should have a TV with 4K/60Hz (or 120Hz!) and HDMI 2.1.