Shadow II carries Netac's DDR4 desktop kits at a single speed and timing across the two capacities in this listing set. There isn't a spread of speed bins to compare here, so the data that matters is mostly configuration.
This one comes as 2×8GB, 16GB total, rated 3200 MT/s CL16. With one 3200 MT/s/CL16 pairing across the whole family, choosing between the two listings is a question of how much DDR4 the system needs, not which one runs faster.
Built as 288-pin U-DIMM for desktop boards, it needs the XMP profile enabled in BIOS to run at its rated 3200 MT/s — without it, any DDR4 kit defaults to a slower JEDEC speed regardless of what's printed on the heatspreader.