The oracle speaks
My current EAI cog works nicely on the phil and I have run DA cogs too. Phils use a campy threaded lockring; and IMO the phil lockrings are head and shoulders above the campy lockrings. If I had campy hubs I would still use a phil lockring. I have some no-name hubs (I think they are gipemme) that use a campy lockring thread and I use a phil lockring on those too.