You asked me for my opinion.. and that is what I will give. Both units are sturdy. Both heat the same.
I prefer the SSV in function, and I will outline why it is the one I prefer.
A funny thing though... Aesthetically, I find the DBV to be prettier!
1-I like a hand held wand, and heater cover. On my DBV, I had to change cover and wand for the control I like. I do not care for hands free wands, because the unit can get pulled of a surface if not careful, and a "hanging glass wand" in a "ground glass" connector can break.
2- I was not always comfortable in all lighting aiming my wand into the DBV hole ( after I put on a standard heater cover). The SSV has an easier access heater (still recessed for safety- I have been in most situations.. it is safe)
3- the SSV is leaning at a very nice angle. You can glance down in there, and see that it is clean, and the heater aims downward too.
This allows you to hold the wand not straight out like a sword, but aiming slightly upward ( like leaning a microphone toward a person to have them speak. This reduces any chance of spillage, or loss from sloppy movement. The SSV is the only high quality vaporizer with this downward angle.
4- Finally.. the dial (heater control knob). It is in the front on the DBV.
I like the fact that the SSV dial is in the back. It is large enough and easy enough to reach when you want it. But remember this is a continuous dial, not discreet ( no "click..click" into positions)
The DBV dial can be nudged, by the wand whip, or by a sl;oppy friend.
The SSV dial is out of the way, and can't be accidentaly nudged, unless you reach for the knob.
I owned both. I preferred the SSV ( still do)
Please remember. This post is not here to make DBV owners feel that an SSV is better.
They are dynamite vapes, and in spite of all of the new technology.. they ain't goin' nowhere!
I have likes and dislikes, as do all the vaporists here, and I tried to answer objectively.