Nand SSD 970 evo NVMe M.2. It cost me 79.99 but the price has gone up to 100(usd). It is 500gb and I use it for my "main" games and I've never looked back. Although I do have a 10Tb hard drive for my other games that I don't play as frequently.
Once you upgrade to SSD you will never go back to HDD - it's just soooo much faster. General experience with PC is better, games are loading faster. Only the price makes it a bit harder to swap.
Upgrading to any kind of SSD even if it is a sata ssd is worth it You will notice it in you day to day usage just check first if it have any dram cache first without DRAM cache Sometimes ssd perform same as a hard disk