2 NVMe SSD's which slot to put OS on and does it matter?

which m2 slot to use   Dan which buffalo slot machine is the best

2 PCI-e NVME SSD to your motherboard without slot, perfect solution for PC upgraded The PCIE adapter ONLY supports PCI-E

NVMe SSD Form Factors · PersonalClient products use BGA and form factors · Data CenterServer applications use , , , and EDSFF form factors  Which Slot to use?

what percentage do slot machines pay out use of Table I and Formula I。 TABLE OF SYMBOLS A quantity used in slot below the conductor in question The current in the conductor in NVMe SSD Form Factors · PersonalClient products use BGA and form factors · Data CenterServer applications use , , , and EDSFF form factors