Bob,
I'm a convert from DxO Elite 5 + updates to Capture One. I switched over a few years ago (Version 20 I think, now on V22) when I found myself frustrated with DxO. I recently went back into DX0 to hunt up the changes I'd made to a particular file to compare to a reworking of that file in Capture One. Now maybe DxO 6 is greatly improved, but for me with this particular file, the C1 version was vastly superior. Plus, again for me, using C1 was just so much easier. Also, now that I'm using Fuji equipment only (used to use a combo of Fuji, Olympus and Leica), I find C1 works better than DxO for Fuji files. But again, that's just me and my subjective judgement.
OTOH, I do like DxO's file system much better. I've never quite been comfortable with the whole catalogue/Session thing. I do wish there was the DxO (and others) style of DAM as aC1 option.
Rene