For some reason, NBA 2K18’s Nintendo Shift version is getting two separate release dates for retail and physical stores. The dates have been verified by 2K Games.
The electronic release of NBA 2K18 on Nintendo Switch is coming out on the eShop on September 15th, 2017. The launch is currently coming out on October 17th, 2017.
If you want more space on the Switch, then it may be best to buy the version. If storage space is not a problem, the model is because you don’t have to wait too long the to go.