Pork Belly said:
When in doubt ALWAYS go bigger, get the #3. You can make great BBQ without the digital.
+1 Brian is absolutely correct. I feel zero need to have an Auber. That being said, I would probably get a #3D if I was to get a new smoker, but I am not going to bother with the integrated Auber addon or purchasing an external Auber for my traditional #3. For me and the product that I smoke it truly isn't needed to produce great "Q".