A:Answer The Nintendo Switch cartridges are very durable -- moreso than you conventional CD-ROM even. The cases they come in are so oversized, I'd recommend getting a case to hold all your games though. Digital would, of course, save you physical space and easy to keep -- but then you have to consider how much digital space is available on your Switch to store all your games --- it can fill up pretty quickly. While you can move games to an external SD Card for storage, you have to move it onto the console's internal memory to actually play and the larger games can take a while to move.
Personally, I prefer the physical still.