Onboard m2 slot or pcie m2 expantion card? which is faster?

Onboard m2 slot or pcie m2 expantion card? which is faster? which m 2 slot to use M2_2, SATA3_4 and SATA3_5 share lanes If either one of them is in use, the others will be disabled this is one of the reasons gaming mobo's which slot games pay the best Out of habit, I use _1 as an OS drive But this may no longer be the best option for gaming PCs with games that use Direct Storage

which slot games pay the best Using first slot M2_1 makes my PCIe x16 lane go to x8 I prefer drive performance over video as I do more work than gaming Not sure if it's

which interview slot is best Locate the horizontal slot on your motherboard that's usually found between the CPU and the PCIe slot, or towards the lower part of the Some motherboards will only have one slot that can run at NVMe PCIe bandwidth, whereas others may be restricted to using SATA bandwidth