I feel like I already know the answer...

logically speaking most rare fans is not With Nintendo anymore and the old gamers already grew up with PS platform and some when to Xbox. So loyalty with rare is useless when it comes to sales discussion. And also other console has their own respective fans for platformer games.

So i am going to use software attache sales and user base number as a my prediction. it far more accurate. So

1. PS4 40% sales
2. Wii U 30%
3. Xbox One 20%
4. PC 10 %

PS4 without a doubt. Although there may be an argument that the Wii U might have the higher attach rate in terms of percentage, by the time the game arrives there is likely to be well over 3:1 in terms of PS4 over Wii U in customers hands. So for sales numbers, the PS4 wins by default.

Rayman Origins and Need for Speed had the highest attach ratio on PSVita, but that doesn't mean best selling. High attach ratio's are common for systems with smaller userbase and fewer retail releases. 

Knack was also a terrible game which should have sold less and hasn't had any legs but I agree there are no perfect comparisons and the best is Rayman Legends because its a platformer with a mostly core audience, unlike licensed titles (lego Marvel+Batman which sold best on PS4) or those toy collection games marketed at under 10s (skylanders/disney infitey that sold best on Wii U). Yooka Laylee is a download only title and hyped by nostagia from an 18 year old game, its main demographic will be adults. And all (decent) platformers sell with legs so I don't see that as an actual argument just more reason for the PS4 to be the highest selling, LBP3 opened with 80k on PS4 and now is past 1m. And again PS4 version of Legends had lots going against, it was released on 4 other platforms 5months before it was released on PS4, yet still sold better, how can we ignore that? But Again, no perfect comparison so I'll just agree to sit and wait

How is Knack a platformer?

If the R & C game is anything like the PS2 games it won't be much of a platformer either.

How is it not? It's defined by Sony as a platform action adventure game and has plenty of platforming gameplay to be defined as such.

R&C was definitely a platform game, later games in the series were too, the new one isn't just a straight up copy of the original PS2 game. It's based on the movie, with some similarities to the original, but it's a new game really and Ratchet & Clank games in general have solid platformer gameplay as the core of what they're about.

A game doesn't have to just have platforming gameplay to be a platform game.

Care to show me these platforming sections in Knack and the first R&C?

Do we define Metroid as a platformer? It has much more platforming than Knack and R & C combined.

My problem is that everyone calls any character driven cartoony game a platformer these days.

There's plenty in Knack, every level has areas with gameplay that fits the traditional platform style, same goes for R&C.
I'd define Knack as a Brawler/Platformer really, but it has platformer elements, R&C is a similar merging of two genres, Shooting/Melee/Platformer.

Art Style has something to do with it too, but not if it doesn't have levels/platforms to jump up and down or across of.

Viewing perspective is also another factor to this, usually 3rd person, 1st person makes it seem a bit different.

TBH many 3rd person games like Uncharted, TLOU, Tomb Raider have platform jumping sections of gameplay, but the main difference there is art style and of course the more cover based shooting, so I guess that changes things a bit.

TBH many games in general don't have one specific kind of gameplay nowadays, they're not just a platformer, even Mario has his share of melee gameplay, sometimes shooting elements.

Too most people though it comes down to art style and the fact that the game has platforming gameplay within it's overall play style. You can't call a game a platformer if it doesn't have any platforming gameplay in the game. ;)

That's where I'm coming from, you may feel differently, but I can see things how I like, same goes for you.

When 90% of the game consists of beating up enemies I just call it a brawler or beat em 'up adventure game.

Probably PS4 just because of the install base. Only reason I can think of, right now.