Hey,i know this post is too old but since
that was also my question i share this , maybe helps somebody.
this link can be helpful :
https://unrealcommunity.wiki/recommended-hardware-x1p9qyg0
i noticed 2 things reading that:
1 - Newer CPUs work better with nvme ssds…and since it offers at least a 16 threads cpu , i think nvme should be a choice.
2 - the main difference with nvme will be seen when working with big data like first time builds,shader compiling…