TL;DW:
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You’ll want a PCIe 3.0 NVME drive at minimum for an optimal gaming experience. Anything beyond PCIe 4.0 is excessive and is a poor use of your money. 
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SATA SSDs are still viable but on the cusp of unplayable. 
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And lastly no one should game on a HDD/harddrive as the performance is beyond abysmal. 


Cusp of unplayable? I have a Linux system on a PCIe 4.0 drive and a Windows install on a SATA SSD. I wouldn’t notice any difference if I wouldn’t know or measure the performance difference. SATA SSDs are perfectly fine for gaming.