We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
"Best" is usually a vague term. Best would be likely a high end enterprise SSD. Costs about as much as a car but is reliable and pumps out data at multi GB/s speed all day long.
How much storage do you need?
How big is your budget?
How fast does it have to be?
How large are your games usually?
Why ssd over platter drives? It's for storage. I'd say that for longevity a mechanical will outlive an SSD.
It really depends there on the games and their disk usage. I do prefer to have NVMe drives for my games, simply not to even think about possible issues with disk performance.
I understand that it can be costly depending on the required capacity, but I do not spend anything on backups for them since they can be easily redownloaded.