a m2 is just a form factor or size type m8
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https://www.techtarget.com/searchstorage/definition/M2-SSD
examples
Samsung 1TB 870 QVO SSD 2.5" SATA 6Gbps 64 Layer 3D V-NAND Solid State Drive - Form Factor:
2.5"
- Sequential Read: 560MB/s
- Sequential Write: 530MB/s
Samsung 980 1TB M.2 2280 PCI-e 3.0 NVMe Solid State Drive (stick) (gen 4)
- 3500MB/s Read
- 3000MB/s Write
Crucial T700 1TB NVMe PCIe Gen5 M.2 Solid State Drive (stick) (gen 5) at twice the price but also 2 to 3 times quicker
- Sequential Read: 11,700 MB/s
- Sequential Write: 9,500 MB/s
so while both priced at time of writing is the same for the same class type, the difference is massive in returns for speed of boot and access and write times, so is a no brainer on which one to install imo, with the gen 5 only to be used or needed if the board supports it and you feel the extra speed is needed, for me i'd opt for a larger and slower version of the less quicker one, then again that's just me
while i have and use samsung i also use Adata as well and had no issues with either.
for me 1TB is the sweet spot for a boot device, but 2tb is always better, but storage depends on the user, for me 2tb to 4tb is fine for storage but that's just me as i have a rather large collection and don't wish to slow any of the pc down to the slowest part so no longer keep older slower type of drives installed in the system, but do use older driver for storage of films, pictures and very very old games which i no longer wish to have always installed