The thing I like the most about the build and design of the Extreme Q is the versatility. This vaporizer offers just about everything you could want from a desktop. The chamber is big enough to hold plenty of material for groups.
You get the two different vapor distribution methods that I mentioned above. All of the materials are high quality and food grade. The fan for the balloons is capable of running at three different speeds, and the digital temperature control allows you to set the exact temperature you want.
If all of that isnt convenient enough, there is even a remote that allows you to control every last feature and setting. You may not think that you would actually use a remote for a vaporizer, but its surprisingly useful.
Especially when you are using the balloon setting and doing something else like watching a movie or playing video games and you want to turn off the fan so that the bag doesnt overflow.
The EVO is also built well. I really like the way the vapor pathway is designed, because it keeps the air completely isolated from all interior elements, even the heater. There is a glass tube that runs through the center of the unit, and the heater surrounds it on the outside.
On the other side, it lacks a lot of the Extreme Qs versatility. While it has a full range of temperature options, there is only a manual draw to change it. So you never actually know exactly what temperature you are using. This may not be a big deal to you, but I definitely prefer the digital display.
Once again, you are talking about two units that are near the top of the game in this department. Neither one is a clear favorite over the other.