Untill we can test them nothing to say.
Selling and delivering starts 15 th of jan this new year.
But what exactly do you mean by "being better" ?
Previewing video on the timeline, Ofx effects accelerating, video rendering or gaming?

Rendering video, video noise reduction (Neat Video) and 4K playback

These are some of the numbers that you should get with Neat Video depending on what GPU you have

https://blog.neatvideo.com/post/gpu-for-noise-reduction

Bench-marking program for Neat Video (You don't need the app to run it)

https://www.neatvideo.com/download/neatbench

I am, maybe its better to say, I was a Neatvideo user, but that's a program of long ago who has gotten upgrades ,but nowadays cameras or even smartphones don't need that tool anymore.
I use it now and than when I have to edit my DV or HDV video's of a long time ago ( more than 8 years).
When I use that app with my Gtx 1050Ti I'm completely satisfied, he's doing that smal videodimensions very quick, so no need to speed it up.
I am able to render my 4K video's nearly realtime why should I wish more now I have plenty of time after my retirement from work.😁😁

I deal with GoPro footage shot indoors in low light situations often and that always needs some cleanup..One company I deal with often passes me phone footage that is grainy as hell, unless you have the newest iPhone the noise on most footage shot indoors is grainy. I agree that newer cameras like the GH5s shoot very clean footage even in very low light situations so a cleanup is not necessary.

The 20 series cards are supposed to be much better at OpenCL, so if that is true, yes, they are much faster with Vegas.

2060 = basically the same as 1070 Ti.

I don't believe that you need ray tracing cores for video editing.