Premiere Pro and After Effects will be the most demanding of hardware resources.
There is a dedicated Video Hardware forum:
https://community.adobe.com/t5/video-hardware/ct-p/ct-video-hardware?page=1&sort=latest_replies&lang=all&tabid=all
I agree with Trevor.Dennis about Puget systems. As a matter of fact, my current video computer (a few years old now) was purchased from Puget.
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