It's true there's no magic in vaporization, we've seen it in a vaporizer study recently (Volcano, Solo, Plenty, DaVinci, Butane). In table 2, we can see at about 98%(IIRC, or 96%) successfully evaporate the cannabinoids in the herb (at specified temp in the study and beside the Butane vape). Vaporizer with longer vapor path (thus more surface for condensation) are a bit less efficient (up to 20% less) but produce cooler vapor (which may help vaping at higher temp). The DaVinci was leaking vapor but it was the only vape to do so and it must be pretty rare among reputable vaporizers.
Even if the vapor (the cannabinoids) in most reputable vaporizer doesn't magically disappear or stay in the ABV, there's of course a lot of differences between vaporizers.
- How they work (ease of use, personal taste, how they maintain temp, etc)
- Size
- Price
- Customer service
- Convection vs Conduction vs Hybrid, Session (can lose vapor in the air/condensation) vs On-Demand
- Time to heat up at proper temperature
- Time to change temp
- Portability
- Reliability
- Solidity
- Battery usage
- Display providing information (temp, battery, etc)
- Ease of use with Glass
- Length of vapor path (for cool vapor)
- How safe is the vapor path
- Size of the bowl (large bowl for groups)
- Efficiency for small or large quantity of herb
- Cost of usage (cost of buying new batteries, new bags, broken glass, etc)
- Etc, etc.
Of course every company will tell you they have the best vaporizer in the world. That's marketing. But in reality all the reliable vaporizers have many happy customers (we can see it at FC) and do a similar job at getting your herb at the proper temp so they can vaporize. There's no magic (you just need to follow the vapor/cannabinoids). The way they do it is vastly different from one another. There's no such thing as best vaporizer, it's a matter of personal taste. Choose one you can see yourself using.