Heatsinks for m.2 devices are mostly marketing.
Their value comes in only during long sequential drive access. Think 30 seconds or more.
m.2 devices protect themselves from overheating by temporarily slowing down.
But, most of what we do is small random I/O. That makes heat protection not so important.
Since the PRO comes with one attached, do not detach it.
Install the drive in the primary slot for m.2 to get max performance.
Since you are interested in cost, compare the 1tb pro to a 2 tb 970 EVO+.
You would not notice any difference in performance in real life.
Increased capacity may be a more worthwhile tradeoff if budget is an issue.
Here is an amusing video:
View...