Nintendo maybe... there's still a lot of people in love with them even after the very rough time they've had recently.

Sony fans in general.

I feel that the smaller the fanbase, the more loyal, but that could be just me

Also the inclusion to make UC4 vs everything else, UC4  vs other platform game type threads, it's easy to see the die hard hard group, at least on here.

Also isn't this 8th gen only?, why is PC thrown in there when that platform doesn't even have gens?. I'd say all 3 have different cases of loyalty though in terms of vocality and where they put their money. 

I would have to disagree.

3DS does not even have to be mentioned.

While the Wii U seemingly getting cut off does suck, there has been some great output, namely new titles like Nintendo Land and Splatoon and existing series like Smash, Mario Kart, and Pikmin maintaining quality.

I have been gaining more than 30 years. My loyalties have shifted over the decades. From Atari to Nintendo to Sega to Sony. From their Relentless software support for their console, offering me The Cutting Edge of consumer technology gen after gen. And closest to my heart they see games as art. Sony has earned my loyalty.

Then that would be Microsoft if you count hand held and console userbase together.  However, if you count OS on PCs (which I wouldn't) then that leave Sony with the smallest user base.  Perhaps it will be Nintendo after the holiday season but then the NX releases.   It is a never ending cycle. 

Vita or Wii U owners.

Sony owners went to Xbox last gen, M$ owners went to Sony this gen, and Nintendo owners were taken by the Rapture, apparently.

Gotta be that Nintendo core base. No one's been rolling with the punches like they have.