Best NVMe SSD
https://www.pcgamer.com/best-nvme-ssd/
SSD prices have dropped substantially over the past few months, and with the arrival of Intel's QLC 660P drive, NVMe is getting dangerously close to matching SATA drives on a price per gigabyte basis. Moving to an SSD is the single biggest upgrade you can make to an older PC, and we wouldn't consider building a new PC without using one for the OS drive.
If you have a modern PC, either with an Intel 6th generation CPU or later, or with an AMD Ryzen processor, you likely have at least one M.2 slot for even faster storage. It's a great way to clean up a build by eliminating cables, and the price premium isn't that bad. However, you're still looking at a $20-$50 premium minimum for a 500GB-class SSD. If you're looking for SATA drives, check our Best SSD for gaming guide.