XCI is often preferred for the base game because it’s a single "clean" dump, but NSPs work perfectly fine.
XCIs can bundle the base game, latest updates, and all DLC into a single, massive file. This eliminates the need to manage multiple separate installation packages. 3. DLC and Update Compatibility pokemon violet switch nsp xci dlc update eshop better
Purchasing from the eShop guarantees instant access to the latest game updates and DLC. You also earn Nintendo Gold Points on eligible purchases, which can be redeemed for discounts on future games. XCI is often preferred for the base game