I also have the OC and the SB versions of the Tatara razor. Yes the OC is more efficient, but the blade exposure is also slightly larger on the OC. The blade support is also a little more rigid on the OC. So we are not seeing the effect of the OC teeth as an isolated variable. If the blade exposure of the SB version had been identical the difference will be less.For me, the OC definitely gives a bit more ooomph to the razor. I have the Tatara Nodachi as well as the Blackbird in both OC and SB versions, and I have since stopped using the SB version, as I find the OC version of both razors delivering visibly better shaving efficiency.
Also, I found that I favour the OC part of my Lupo DC much more than the SB side...
Wonderful hobby we have, don't we? Happy shaves!
I like OC razors, but if all else is equal the OC effect is not that big.
The Lupo OC side has a smaller gap then the SB side (0.95). I am not sure what the teeth does to the exposure, but i assume it is a little larger then the standard 0.72. So we are not seeing the OC teeth as an variable here.
An OC razor should in my opinion be rated the same way as SB razors with regards to blade exposure, gap etc. The teeth is just one variable that in my opinion contributes less then e.g. blade exposure. OC might add blade exposure if it is machined out from a SB base plate, thus giving a more efficient razor.