Or Black is smoother, softer than Antaeus, especially compared to the original version of Antaeus, which was very strong, sharp and extremely long lasting.
I've layered Or Black with Antaeus (both versions) and the result was amazing. The two fragrances enhanced each the other, perhaps too much, I could smell the mix even after 2 days.
The current version of Antaeus, which is softer and short lived compared to the original version, has more similarities to Or Black, but anyway I prefer Or Black.
I can easily compare the 2 version of Antaeus because I have a vintage bottle from 1982 (I was young) and a sample of the current version, which is not really so interesting.
The difference is especially in the drydown: Or Black is sweet-ambery and velvety. Antaeus is sharper.
Hope this help. W