Get the 500GB.
The only really noticeable difference in speed is if you were moving large files like 4k videos.
The random speeds on SATA vs NVME is barely noticeable regarding the system/game performance.
Or check how much does the SX8200 Pro cost, its usually a lot cheaper and better than the 970EVO so you may be able to maybe get 500GB NVME if it's cheap where you live.
For SATA drives, also check Crucial MX500.