As others have stated, SSD's give a large boost how quickly maps and other content within games load. I personally use a mixture of drives. I use a large SSD for the OS and games (1TB) and utilize HDD (2TB) for data storage. However, games are very large in size now-days so it is easy to fill up even a 1TB SSD, depending on how many games and what type of games you're storing. I will normally store my competitive games (CS:GO, Fornite, Pubg) on my 1TB SSD so that I can avoid stitching or stutters with texture/prop loads, and then place games that are less competitive (Assassins Creed, Doom, GTA 5) on my HDD as I am less worried about rare hitches during gameplay. Hope this helps.