Opinion can be based on reason, reason =/= wishes.

It's a matter of common sense for anyone who have a decent analysis on japan market and good knowledge about games coming.

PS4 will sell poorly but still wipe the floor with the Wii U.

That Wii U software lineup is terrifying. We could have a year with less than 10 retail releases and none of which are likely to sell more than 500k.

You're being incredibly generous to Zelda there. It's been a long time since the series was relevant in Japan. For comparison sake, the 3DS game is around 400k LTD. Twilight Princess and Skyward Sword didn't hit 1 million between them on the Wii's massive install base.

Bloodborne, FF Type 0 (with FFXV demo) and Disgae vs. nothing in Q1. The PS4 is gonna start the year much stronger and I think it'll end up outselling the Wii U for the year.

If FFXV and MGSV both release in 2015, I think it's a lock.

MGS is confirmed for 2015 and I'd be surprised if XV didn't see 2015 japanese release as it was confirmed that the demo would be released in march (not just a demo code)

Wii U is winning now but no one is willing to back up their opinion?

It's sizeable compared to others on the list. Though, yes, Zelda isn't as big as it used to be in Japan.

Destiny boosted PS4 sales in Japan to 23k despite also being available on PS3 which has a massive install base.

Mario Kart 8 and Hyrule Warriors despite being huge Wii U exclusives boosted hardware sales to 18k.

Now, lets not consider XB1 since it has a very small install base in Japan. So we can consider FF Type-0 HD as PS4 exclusive in Japan. Now the original released in 2011 so its bound to hurt some sales. However the new one looks like a huge improvement over it and it shall easily sell more PS4's than a cross-gen multiplat new FPS IP like Destiny.
Bloodborne will sell to the Souls fanbase, around 300k of which are in Japan. Many of them are likely not to have a PS4 yet so will buy one for this game.
Metal Gear Solid 5: The Phantom Pain will sell many PS4's as well in Japan as it also has a special edition. On top of these games consider all the other multiplats and exclusives on PS4 releasing in 2015 and it all points to it selling better than Wii U.

Why would you add only "some"? A pollster shouldn't be biaised. Thank you to add the above titles as well.

given the tv coverage of morpheus here these past few days, i'd say PS4.