NX = 9th gen
PS4 Neo = 8th gen

still

NX= the first of the next generation

Ps4Neo= this generation

No. to say that is like saying the WiiU isn't part of the PS4/XB1 gen cause soec was its more in line with the PS3/360. now one told Nintendo not to put in 8GB of RAM or a more powerful CPU/GPU. they chose to do that cause they felt that was all the need needed to complete with whatever Sony and Ms were releasing just a year later. 

they were also the market leaders at the time. meaning they had no pressure of launching first. they literally could have waited for sony and MS to launch. they made all those choices on their own. 

If they release a new console now, even if power wise it's more in line with a PS4. It's still their next generational offering after the wiiU. for the chatzs sake, they could gropu it in with the PS4/XB1. or wait

so say the NZ comes out in 2017. then by 2019/2020 the PS5/XB1 irls released. what happens then? should we all assume that that's the 9th gen and Nintendo hasn't made their 9thgen console yet? so what was the wiiU? It think then it would rather be that nintendos 9th gen console released 2/3 years earlier then the rest. 

We all are wikipedia

I thought gens weren't about power but which competition every device faces during its lifetime? in that case neo is just a ps4 upgrade, while nx will basically be cross gen between competing ps4/x1 and their successor if they ever release, so 3 years each gen

NX would be competing will them all. Also, if Sony discontinued the regular PS4, they certainly wouldn't be competing then would they? I use don't think gens matter much. It's ok if you disagree tho

This 

Either 8.5 or 9th Gen, but both get the same gen moniker from me.

8.5 sounds the most right to me, as it mirrors the early 90's: Several new consoles where coming out some years after MegaDrive (aka Genesis in the US) and SNES (3DO, Philips CDi, possibly including Atari Jaguar) while others got Upgrades (Megadrive with MegaCD and 32X, NECs PC Engine with the SuperGraphX and the Turbo Duo). The consoles that came out back then where called Generation 4.5 in hindsight after the Saturn, PSOne and N64 got released since there was a clear gap between the gens in performance and the release dates of these consoles where pretty much right in the middle of those of the big players on the market.

there are no generations anymore. Just you watch! Consoles are going to be just like smartphones -- though with less frequent hardware upgrades.

This conveniently allows us to compare NX sales to ps4, and add NEO figures to the PS4 total.

With the Wii-U belonging to the hardware generation of PS3 / 360, the NX will belong to the same generation as PS4 and X1. Since both systems will be upgraded soon, the NX will have the weakest hardware. It makes no sense to start counting a new generation, since PS4 Neo and the X1-2 will be much stronger than the NX.

A console generation is defined by an external standard. However NX is releasing due to awful business from Wii U, so its not a product that is demanded by consumers or industry, but born out of sheer necessity.

Looking at wiki and the 3rd gen, Sega released SG-1000 in '83 and the master system in '85, so its not uncommon
for a company to release multiple consoles within the game gen.

https://en.wikipedia.org/wiki/Third_generation_of_video_game_consoles

Also looking at 4th gen, you can throw out the ".5" also. You have turbo grafix 16 in 1987, and Neo geo in 1991, still considered the same gen even though Neo geo was more powerful (like ps4neo/nx will be)

https://en.wikipedia.org/wiki/Fourth_generation_of_video_game_consoles

NX is apart of the 8th gen, as is PS4Neo. But if you don't believe in console gens as we understand it, then clearly Nintendo is in their own lane and only for them can it be considered as "a new generation".