I haven’t extensively tested it but I have been able to get it to work with both. I was also able to use a usb hub with a Logitech dongle for a mouse and a Bluetooth keyboard. On my flights, I’ll normally pair my Sony Bluetooth headphones.

All of it has worked seamlessly for me.

The following context is at least a year or two old, so I’m betting things have gotten a lot better since: I had issues when pairing multiple Nintendo pro controllers to the steamdeck. It would work and then suddenly drop one or both of the controllers. When using a mouse and keyboard with the deck, I’ve had issues when using game mode (as opposed to desktop mode). Frequently this resulted in my character looking straight at the ground no matter what I did. When in desktop mode, performance takes a hit and my games would drop frames occasionally. I originally hoped I could seamlessly dock this and play couch coop games. At the time this functionality felt mostly broken, but I’ve been told it’s gotten a lot better in later patches.

I have the older steam deck, but I still love it. I’ve used it for rocket league, a whole suite of indie games, Sifu, Like A Dragon, and a semi tolerable bg3 experience. Emulation is also pretty fantastic.