For what it's worth... I use the DBV for dry flower and I love it. I'm definitely going to shell out for the Essential Oil Kit (glass) that handles concentrates. I'm familiar enough with the DBV unit that I'm very confident that it will more than suffice. Only reason I have not already up-converted is that I have other delightful options.
I love my Lynx wax pen. Portable, discreet, works well. I also vape using an RDA, and I found that I can flatten the coils and get great vapor, either use temp controled mod, or modulate temperature by experience, it doesn't take long to learn by feel how hot you are getting your coils.
I'm so happy that I kept my DBV when I took a long hiatus from cannabis, because it's a solid workhorse. I think there are more glass options for the SSV. I'm sure that a lot of the newer stuff is fantastic, but I can't comment on those.