You sir, are either a willful idiot or a fanboy of the highest caliber.
Nvidia itself basically said that they sold a 3 GB card, with a memory structure whose last bits were only designed such that "...GTX 970 is a 4GB card. However, the upper 512MB of the additional 1GB is segmented and has reduced bandwidth. This is a good design because we were able to add an additional 1GB for GTX 970 and our software engineers can keep less frequently used data in the 512MB segment..." That article that quote comes from can be found here:
http://www.gamespot.com/articles/nvidia-boss-responds-to-gtx-970-false-advertising-/1100-6425510/
If you are to be truly honest, that's the Nvidia team peddling BS. You could bend over backwards and accept their logic, but if you do so then the Fury Xis the absolute best card currently on the market. You just have to reduce your sample size to a few hand picked titles at 4K, where the 980ti is beaten.
What we are arguing is to have a consistent standard for judgement. Right now, you've got two options. Either both companies peddle whatever BS will move cards, or both companies are 100% honest because they can find at least one instance where their claims are true.
Nvidia, AMD, and Intel all say whatever they need to to move hardware. This is why being an early adopter sucks so hard. If you don't wait for reviews, you'll always be disappointed. Stating that one manufacturer, or another, is uniformly better is stupid. Neither is better than the other, only their currently offered products are better or worse when measured to one another.
Edit:
If the 3.5 GB memory thing is still an impasse, maybe you should review an article from a year ago, that is surprisingly still accurate today
http://streamcomputing.eu/blog/2014-08-05/7-things-nvidia-doesnt-want-know/.
That's right, people doing actual coding work with OpenCL and CUDA are calling Nvidia on BS. Kinda seems like the people actually using GPUs for stuff other than gaming recognize that AMD may not be doing well, but it's because of their marketing and not actual performance. If the AMD marketing was half as slimy as Nvidia they'd be claiming Fury X cured cancer, because it can be used for BOINC and the like.