I've been using a Davy for quite a few years, and a Traeger Lil' Tex modified with a PID to work like a GMG. Most of the time I've gone to the Traeger because of the larger size, and I do not really notice a big difference in pellet consumption.
I really dislike the legs on the Davy which I have read some people say "they should break the thumbs of the person that designed the legs". However, I recently purchased an inexpensive Harbor Freight roll away tool box for the Davy, removed the legs, and now it is at chest height so it is much easier to use. For the first time a couple of weeks ago I actually gravitated to the DC over the Traeger.
Because I like to travel in an RV, I would again purchase the Davy despite the awful legs because it is a perfect tailgating cooker.
I purchased another Davy for my son, and also gave him accessories that allows him to cook much larger quantities. For example, a rib rack that holds the ribs vertically so he can cook 3 Costco racks at a time. He is very happy with the DC, especially with the cleverly designed accessories that allows him to cook what he wants.
The bottom line is that if I had to make a choice on a single pellet cooker, it would be the DC for the versatility and the price. However, if I did not travel in the RV, I would purchase the DB in a heartbeat - the cost differential is not that significant.