The DBV will draw attention where the PD does not on its own. The PD also do not indicate it is on unless you touch it, no lights or glowing as with the DBV. The PD also looks like it belongs in an dorm setting where the DBV does not. I love the DBV but it would not be my personal choice in the area of stealth.
Actually I would consider the Magic Flight Launch Box. It is stealthy, very small and portable and is generally considered a very low smelling vape amongst vaporizers but you have to deal with rechargeable batteries and depending on your use this may be an issue. If the battery aspect is an issue I recommend the Vapor Genie but it is lighter based but a very good portable vaporizer.
The PD has a long waiting list so if time is a consideration I would consider a Myrtlezap which is very similar to the PD. Both makers know, respect each other if you should go that route but I highly suggest researching those options.
If it was me I an I wanted a vaporizer for a year in a dorm for single to two people using it, I would get the Magic Flight Launch Box due to its small size, it fits in your hand, it requires only a battery to work, can be easily hidden and is portable.
For a desktop version I would go with a Purple Days or a Mytrlezap. I would not actually consider the DBV in that environment.
Hope that helps at all.