If you want wired storage that can go between machines easily, your best bet would be an external hard drive or ssd. The ones I would recommend would be the Samsung SSD T7 or the Seagate Portable Hard Drive. Both can be found on Amazon. I highly suggest going with a NAS since there is no unplugging needed. If you want to make it simple and you have some programming knowledge, configuring a raspberry pi as a NAS is a great idea.
If you do go with the Pi NAS, you might opt for a Pi clone since genuine raspberry pi's can get expensive. Linus made a great video showing different clone pi's and their pros and cons. For Pi NAS software, I've always went with OpenMediaVault because of its customization but the choice is yours. Good luck and let me know if you need any more help!