Romantically? Activity, without question. I think Activity is better than duality for marriage, but everyone should experience duality. It makes for good experiences to reminisce on in one's elderly years, and provides a source of deep pain from which endless wisdom may emerge.

I also really like my beneficiaries and supervisees, and mirror depends because there are so many EIEs in the world that half of them will automatically suck, though the other half could definitely make for a great friend.