If the question is defined as "Which other Nintendo hardware is most reminiscent of the Sw2 hybrid platform, not including Switch?", then this is the first time I've been in agreement with any stance JackHandy has had. Trying to say that any other device Nintendo has released is even remotely similar to the switch platform, based on that perpective, is a really hard stretch.
If the OP is asking about how we feel about similar launch sales or how the platforms were game changers for their time period based on what the new hardware brought to the table, or launch window game releases feel similar to another generation, that's a whole different story.
As far as the platform itself, the closest possible stretch is Wii-U and it isn't even in the same ballpark. You could barely get the tablet to stream a game from the living room to the bathroom, let alone be a portable system that plays console level quality games. It's not even worth trying to draw a comparison.
