I accidentally hit hours when nook asked me what I look for in a store. Now he downgraded to Nook n' Go. :[ Can I upgrade again? or would I be wasting bells
It depends how you like it. If you are up until 1 AM selling things to him (i.e. fishing) and then want an early start (he opens at 7 AM) then get Nook'n'Go's. It has barely any more merchandise than the Cranny, however.
Nookway's - I'm not sure.
Nookington's has a lot of stock. That's for sure. And carries almost all of the tools each day, with 7 flowers and 3 saplings as well. It's a hootenanny.