Sandisk SN5100 Blue 2TB M.2 PCIe 4.0 NVMe SSD/Solid State Drive vs SANDISK OPTIMUS GX PRO 8100 M.2 (2280) PCIe Gen 5 NVMe 2.0 SSD
Specs side by side at each model's entry configuration, with the cheapest crypto price for each.

Sandisk SN5100 Blue 2TB M.2 PCIe 4.0 NVMe SSD/Solid State Drive
1 configurations
from $310

SANDISK OPTIMUS GX PRO 8100 M.2 (2280) PCIe Gen 5 NVMe 2.0 SSD
6 configurations
from $1,349,999
2 of 2 specs differ across these 2.
Questions
What is the difference between the Sandisk SN5100 Blue 2TB M.2 PCIe 4.0 NVMe SSD/Solid State Drive and the SANDISK OPTIMUS GX PRO 8100 M.2 (2280) PCIe Gen 5 NVMe 2.0 SSD?
2 of the 2 specs we track differ at their base configurations. The table above marks every one, and flags the better value wherever a spec has a better direction.
Which is cheaper?
Sandisk SN5100 Blue 2TB M.2 PCIe 4.0 NVMe SSD/Solid State Drive from $310, $1,349,688 less than the SANDISK OPTIMUS GX PRO 8100 M.2 (2280) PCIe Gen 5 NVMe 2.0 SSD. Both are the cheapest total, shipping included, for the entry configuration.
Are you comparing the same configurations?
Each model is shown at its entry configuration, which is the only fair basis for a like-for-like table. Open either product to switch memory, storage or chip and see how its price moves.