Please, I beseech.

STOP. USING. VGCHARTZ.

Now, many people are going to say "we are on VGChartz, so why i can't use VGChartz!?" my answer: because if we want SERIUSLY talk about sales, we using the real source. If you guys want see the VGChartz numbers, and you want believe it, eeeeeeeh... i wanna say you can't, but if we want have a serius discussion about sales, VGChartz is nothing.

That said. as for now, sales are:

Japan

Vita: 603.251

Wii U: 364,732

USA

Wii U: 447,000

Vita > 100,000

WW ( shipments )

Wii U: 810,000

Vita + PSP > 450,000

Those are the numbers with how we can discuss.

In this case we can't compare both with eatch other. It's not fair how you are doing this.
We got only 2 NPD's this year with PS Vita sales and 7 NPD's with Wii U sales.
We only have PS Vita numbers for 1 quarter (and they are included with PSP numbers) and we get Wii U numbers every quarter. 

I know that VGChartz sales are very very off, but it's still better than an incomplete comparison imo.

Vita vs. Wii U is basically the only close comparison that can be made between eighth gen systems. With every other combination of systems, the outcome is a foregone conclusion.

VGChartz shows a 180k gap -> http://www.vgchartz.com/yearly/2015/Global/ 
Nobody knows why my gap is only 34k...

In this case we can't compare both with eatch other. It's not fair how you are doing this.
We got only 2 NPD's this year with PS Vita sales and 7 NPD's with Wii U sales.
We only have PS Vita numbers for 1 quarter (and they are included with PSP numbers) and we get Wii U numbers every quarter. 

I know that VGChartz sales are very very off, but it's still better than an incomplete comparison imo.

Have you rechecked each individual week for updated numbers? You might have missed something there