The naming is confusing because the WX "Pro-series" are OEM only, sold currently by Lenovo as prebuilt workstations only (later by other system integrators like Dell and HP probably). You shouldn't be able to buy them separately for custom build like X-Series.
But performance is pretty identical, 16-core WX will be on par with 16-core X. You liked 16-core CPU vs 32-core CPU, so one of them will be twice as fast as the other.
The WX has 8-channel memory support, but we haven't seen if it affects Corona positively further compared to 4-channel TRX40 platform since those chips/systems just aren't readily available and popular.