The Western Digital WD Black SN850X 4TB wins in 2 out of 5 comparable specs, with 2 ties. Its biggest advantage is Sequential Read (3644% better).
IronWolf 4TB wins in 1 spec (MSRP: 74% better).
Recommendation
Choose WD Black SN850X 4TB if you want the best overall performance — especially sequential read.
Choose IronWolf 4TB if msrp matters more to you.
