How is ending up with the least amount of owners out of the three "winning in terms of popularity"?

Playstation 2, was my first Sony console and I enjoyed the Gamecube more.
Wii U, lot of good games but nothing that really stood out...maybe Super Mario Maker.
Xbox One, only because its the only Xbox I've owned (bought very cheap, pretty much just to play Rare Replay) not planning on buying future Xbox consoles.

Sub-1080p and frame dips, constantly?  I have both a PS4, and a PS4 pro, and every playstation for that matter.  PS4 is a shame, as well as the pro model.  Guilty Gear Xrd, Dead or Alive 5, Grand Theft Auto 5, Tomb Raider, The Last of Us, Uncharted 1-3, God of War 3, Beyond: Two souls.  The PS4 is basically PS3.5, and still crap at 1080p gaming.  Frame rates are better with the pro, but even still...  It's shameful.  So, when I want to play Tekken 7, or any other multi-plat, I do it on PC.

My PS3 gets more use than any of my other consoles. 

I do not understand what you mean about the Switch.  It's a handheld device, and I'm not playing multi-plats on it.  It's my first Nintendo console, and I've been Sony/Sega biased my entire life.  I've never been a Nintendo fan, but the switch is great.  I use my PS3 more, than my Switch, but my Switch more than my PS4.  I use my Sega Genesis more than my PS4.

I'm not getting Doom on switch, I have a PC for that.  I'm not playing any multi-plat on console.  I have a PC for that.  I'm using consoles specifically for the exclusive content/features.  If I get a game for the switch, it's because I can't get it for anything else, or I want the added ability to play away from the TV.

And as for Xbox, I'm not forgetting the BS microsoft was doing.  I have forza, gears of war, killer instinct, etc.  I play them on PC.  Xbox live is free on PC.  The xbox catalogue is on PC.  I have no use for one.

The original Xbox introduced features that consoles until it didn't have, like hard drives.  The 360, had it's massive failure rate and RRoD issue.  Literally everyone I knew with  360, all my friends, siblings, a few cousins, they all got RRoD.  I forgot about that when I was coming up with my list but I'm not touching another microsoft console again.  The original Xbox is just the one I disliked the least.

I also find it weird that people claim the PS3 was overprice, despite the price of that console dropping considerably since release.  If they included backwards compatibility, the same PS4 console would be 600 dollars too, with the added benefit of playing older games.  It didn't STAY 600 dollars, and there was always a cheaper model.  Why complain about the flagship model when there were other variants that did almost the same exact thing?

Xbox One because of it's dire situation in terms of exclusives.
PS3: Just a total mess
N64 for it's alien controller.

Wii
PS3
OG Xbox

Nintendo: Gamecube. The controller alone secured this one. The dpad made playing most 2d games and 1v1 fighters almost impossible. It also hurt my thumb. The different shaped buttons, the c-stick size, the stupid z-trigger... ...then the games were basically too optimized for my taste. It felt like the technology getting better actually hurt that whole console generation but mainly Nintendo. Most of the games people love for Gamecube like Melee and Double Dash and Sunshine are my most disliked games in their franchises respectively. That console almost ended my time run with home consoles. Thankfully, Wii came along and saved me.

Sony: PS4. The console was still great in my opinion. However, it is their worst home console effort from top to bottom. The launch was more about the potential and the hype than anything since the console did not really offer that killer lineup. This generation as a whole is weird and I still have a hard time wrapping my head around it. However, it is nice to say Sony's worst console (in my opinion) is still a monster console.

Microsoft: XBOX One. The console is useless. I own a very good PC and at no point do I feel justified in getting anything on XBOX One instead of PC (where I think every XBOX One game is). I not only get better graphics and performance, but I get to pick the type of controller I want to use for (almost) all games on PC. Microsoft cut their own head off by not offering a deeper list of exclusive XBOX One titles (not shared with PC). That console is the first console in twenty-two years that I have traded in.

For moi...

Nintendo: NES

Probably gonna get a lotta flak for this, but despite launching many legendary franchises I find almost all its games unplayable today.

Sony: PS4

Mainstream gaming this gen has taken a direction that I personally find really dull and uninteresting, and PS4 epitomizes this. 

Microsoft: Xbox One 

Same as PS4.

Nintendo - N64
The games were nothing like the NES and SNES games.  To me Nintendo adopted a "it isn't broke but we're going to fix it anyway" mentality with the N64.  My idea of a good console is a decent mix of new titles and sequels to beloved games.  Everything on the N64 felt new.  It may have been called "Mario" and "Zelda", but it didn't play anything like previous entries.  It broke continuity with previous consoles by having nothing that felt like what came before.

Sony - PS4
PS4 games just feel so "meh".  I still feel a good console has a decent mix of new titles and sequels, but PS4 has the opposite problem to the N64.  Everything I want to play is a sequel and often the sequels are "meh".  I don't even care about Final Fantasy or Kingdom Hearts anymore (for example).  These games just aren't as good as they used to be.  I tried playing The Last Guardian, but I haven't gone back to it yet.  Even the few games I like: Spider-Man, Uncharted 4, Dark Souls 3, these are sequels to games I like.  That is good, but where are the new experiences?  I haven't found any new experiences I like on the PS4, and a lot of the sequels to games I used to like are "meh".

Microsoft - all/none
Never owned a Microsoft console, so I can't comment.

SEGA: Sega Mega CD/32x ...
Nintendo: N64 The controller
Sony: PS3 All in all a boring Gen

Nintendo: Nintendo DS. Sony: PSVita. Microsoft: Xbox One.

The first two had poor curation and started the trend of crap games that would end up leading to mobile rising. The last one is not really because its "the worst" but the least good out of all three. It started too slowly, had terrible PR (for one GaaS is still happening and no one minds) and never got around to using the ESRAM to compensate for the slower memory. Otherwise, it's all good.