Naniwa v Shapton for finishing?

I have been using a Naniwa SS 12000 for finishing and tuneups when a razor drags a bit. No complaints. Now I'm wondering if a Shapton 16000 might "have an edge." Am I likely to see any benefit of a Shapton over the Naniwa or am I just feeding my HAD? What say you with experience with both?

Both are pretty darn good finishers.
If you have one, then the orher will add little to nothing IMHO.
Naturally, many of us had to find that out ourselves:)