1000GB RAM sounds as a good marketing trick...
Most (if not all) those tictid are manufactured by Tanix. I know it because cases for models as TX3 mini, TX3 max, TX88... or systems as ALICE UX or new MG mini UX/UI have been designed by ME within those last two years.
We have ExoTv IPTV app now running on Exodux EX1 (S905L - 1GB 16-bits RAM) and it is far smoother than every box S905W - 2GB 4-bits RAM.
As well as those devices are locked to 720p graphic layer (UI) because the poor 4-bits performance, while 16-bits RAM allows the box to render 1080p UI. Don't talk about CPU speed...
If combine 16-bits RAM with vector images, the UIs will be really beautiful and modern.
Is it better 2GB than 1GB? Well, as you can see, it depends, it is same as "how many megapixels are better for a camera", it depends on many things and can't be reduced to a number without knowing more specifications.