The portal only really works where you have decent internet, in practice that’s basically just within your house (because hotel internet typically sucks, and you probably can’t play at work).
A more powerful variant would allow you to play anywhere (on your commute, in a plane, …).
So they would be completely different products. A cheap portal if you want to play in your bed or if someone’s using your TV, this more expensive one for real playing on the go.