For me I feel as if DW is doing more damage for me.
In my parses I noticed that there was not a huge gap between the two so I sort of just go with whatever I feel like at the moment. Currently I am either DW two cedar crudgels, or the BBC (plain version, non electrified) so part of it for me is that the BBC lacks a damage proc of its own, I have a feeling the two would be close enough to matter very little if I had a good proc on my 2h. The damage rating is the same, but the crudgels win out with their combined 26 agi and 16 str. So for me it is more of going with slightly better stats and what I feel appears to do more damage based on in game factors (how quick stuff dies, how much damage i take, how much power I use, etc...)
That being said I pretty much only use either of those when solo or duo or in a trio with no healer. Otherwise I use the SBS and SM/cedar club. I feel like in a larger group there are other classes who are now so much better at dps then me that I am better off catering to my stregth, which is taking damage and not dieing. I use the offensive stance if there are 2 healers, unless they still seem to have problems healing me, though I only notice this happening with poor choices of healer combinations such as two of the same or two that do not compliment each other.
Jinos
L D'L