Oh, Pugs, thou makest me to anoint myself with Santos, thy Kouros and thy Antaeus they beguile me. It's a really good question for reasons I'm powerless to explain. Maybe because all three have a sort of equivalent curiosity value as relics of another time. Things that I don't wear regularly but which evoke very strong and particular reactions.
I'd have to sadly choose Antaeus as having aged most gracefully, in part because the perplexing slight animalic sweetness still seems mysterious to me: animal, herbal, mineral, ethereal? The same note, is it rockrose?, as in Givenchy Gentleman. Pegasus might smell like this. Or a coat made of Pegasus. Or chaps.
Santos, to my nose, is the best of a breed of petitgrain-heavy, oriental-leaning chypres that includes Versace L'Homme. But I can live without all of them. Kouros is more a curiosity to me: fun to play with, a fine subject for layering experiments but not a love.