A shop here in France, is making stock cleaning (the store will close). There is a xbox one elite for 339 euros (obviously without any game). And this same store has Mario Maker Bundle with the Wii U for 300 euros. I already have PS4. What is the next console to buy for Christmas, friends? A little help?

I'd say wiiU, but there is a good chance it might get a price cut soon given they probably want to clear their stock before they launch NS. So if you buy a wiiU now, you have to accept the fact that it might be 100-150$ cheaper a few months from now. However, there are a lot of great wiiU games out there and I've definetly had more then my money's worth with this system. So, it's definetly not a waste in my opinion.

Depends on what 1st party games you want

I would wait for the Switch tbh, since most Wii U games are most likely going to get the switch treatment so you would not miss out much if you wait for a few more months

If not, just get the Xbox

Are you into Nintendo games like Mario 3D World, Pikmin, Wii games, or Smash Bros? Then, get the WiiU. You should have had one already.

You into Xbox 360 games, shooters like Gears, Quantum Break, racers like Forza, or Rare titles, get One.

Funny that you ask this in Nintendo discussions... do you really expect unbiased answers that way? ;)

Nevertheless, €300 for the MM-Bundle ain't that good. You can f.e. order it at amazon.de (they deliver to France) for much less: https://www.amazon.de/dp/B01KMCX9R6?m=A3JWKAKR8XB7XF&tag=idealode-am-pk-21&ascsubtag=em0bnqCDzfhdqZSYCewBMQ

If the Switch is getting a lot enhanced ports of Wii U games like the rumors are claiming, it may be best to get the Xbox. Or get neither and wait for the Switch next year

Get the XB1. The Switch is coming out March and will be getting better versions of wii u games like Zelda, Mario Kart, and Splatoon.

Personally, the exclusives on Wii U would appeal to me more, but the Xbox also has the benefit of continued support for the next few years, at least. If you don't want the games that are out for the Wii U now, or Zelda Breath of the Wild, you should probably choose the Xbox. 

That was a nice info, thanks. But the packaging is in English or French, I do not know anything in German? The image on amazon.de is too small to see the details. 

double post, sorry.