I tried several in the past, norton, nod32, avg, kaspersky, bullguard. I finally settled with webroot security because it takes up the least resources and doesnt slow my pc down
Absolutely, especially the NVMe PCIe M.2's. Once you go down this path theres no coming back.
For the OP, remember that M.2 is just a form factor. For example, A M.2 Samsung 256gb EVO 850 SATA III is just like a 2.5" EVO 850 in terms of speed. The real difference in performance is with M.2...