DPP honors your camera settings for "High ISO NR" and that is likely why DPP "looks" cleaner with some results. However, I can guarantee you that DPP NR isn't superior to all the other NR tools that are out there too.
However if you are a person that likes to get things set up in camera and then do minimal post, then do that and just use the JPG from the camera. DPP will create the same results, as its code base incorporates the firmware running in the camera. If you want the best, you will want to tell DPP to not honor in camera settings, or at least set the NR sliders to zero, and then post process the resulting JPG files, or use a different raw/JPG workflow.
This is why it is so difficult to gauge how well the R7 works because invariably image files shared have gone through something that processed it, whether DPP, LR, etc.
Photons To Photos now has support for the R7, it is so very close to the 90D as expected. Interesting behavior though at whole ISO vs intermediate at the lower ISOs. Blue is R7... At the maximum DR, there is maybe a 1/3 stop DR more with the R7 at lower ISOs.
Shadow Improvement however shows that they are doing something differently under the covers with the R7, I believe, based on the delta between the 90D and R7.

Image hosted by forum (
1165957)
© TeamSpeed [SHARE LINK] THIS IS A LOW QUALITY PREVIEW. Please log in to see the good quality stuff. Image hosted by forum (
1165958)
© TeamSpeed [SHARE LINK] THIS IS A LOW QUALITY PREVIEW. Please log in to see the good quality stuff.