When Pete briefly played my alto JJDV and then his RPC(90R?), I thought the DV was comparatively a bit brighter, more edgy and more focused.
We each liked our own better...just as it should be 🙂
I know that I am good enough to get anything like its 'full potential' from the DV (yet)!
I found my RPC (80B) ....now residing elsewhere...just a tad more resistant than the DV, but my teacher couldn't hear any significant difference.
I have a JJ HR 7 with an Ed Zentera baffle which is, I think, very close to the 80B in sound and feel.