MrKill :
This may be a dumb question but what is the difference between the sata and NVMe.
Not dumb at all, because the current batch of drive types is rather confusing.
Bottom line...in some use cases, the NVMe type drives can be significantly 'faster' than SATA drives.
Even when both/either are "m.2". Again, the "m.2 is just the physical connection type.
A SATA m.2 drive like the Crucial I linked above works at the same speed as a regular 2.5" SATA drive. A Samsung 850 EVO, for instance.
Just that its in a different package.
However...your intended use case of the OS and a couple of games...you would not see any real performance benefit for spending that extra $$ for the same size drive.