I'd say neither. As a Handheld it's Nintendo's 5th Generation.
If you keep handhelds seperate from home consoles you would get 5th gen.
If you want to consolidate both types of systems into 1 generation we would seriously have to consider PS5/XSX to be 10th gen.
Right now, the switch is a little bit less than 3.5 years old. And by the time PS5/XSX release it will be even older.
But you know what? The GBA released 21st of march 2001 and the NDS 21st of november 2004 -> 3.66 years apart.
Also the switch launched more than 3.66 years after PS4/XB1
So if 3.66 years are enough for a new generation (GBA -> DS), then Switch would be the first and only 9th gen system and
PS5/XSX would be Gen 10.
However, we COULD also presume that the PS4Pro is a Gen 9 system, because it is the only system to support VR,
thus giving it PS4pro "exclusives" in a way. It would become real' messy though.
So it's either Gen 5 (handheld time line) for switch, or gen 9 for switch with PS5/XSX being gen 10
Well baseline PS4 also supports PSVR.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
Azzanation: "PS5 wouldn't sold out at launch without scalpers."