I think you have a couple of things going on here that determine why some pellet cookers put out a smokier end product than others.
1) The controller. Each manufacturer has to have the controller “tuned” to the specific pit that they design and sell. Almost all manufacturers use off the shelf controllers and have them tuned the best they can to the pit they are manufacturing and selling. It’s not a bad thing, but it’s not the best. I say that because you will see companies like Pitts and Spitts. They are using an off the shelf controller and if you watch those pellet grills cook away, they have almost constant light blue smoke. It’s pretty impressive how dialed in they were able to get that controller. On the other hand, I think that many manufacturers did the best they could with what they had to work with and the end result is not as good as it probably could’ve been. In other words, the tuning of the controller to the particular cooker that they are selling just doesn’t seem as good as it could be from a smoke standpoint. I think of the GMG Jim Bowie for example... I hear nothing but complaints about an absolute lack of smoke flavor. On the other hand, you take their Daniel Boone or Davy Crockett models and people seem to love the amount of smoke they put out. Same company, same controller, different cooker models... you see, there are three different cookers in this scenario all using the same controller. GMG had that one controller tuned the best they could for the various sizes of cookers they are selling.
Then enter a company like MAK. Their controller is made by them and for them. In other words they were able to manufacture a pellet grill and controller that was 100% meant to be married together. From the ground up, MAK had full control and oversight of every single aspect of their lineup of grills. MAK was able to build a controller perfectly suited to the cooker and a cooker perfectly suited to the controller. It’s very dialed in. BUT, as already mentioned, so is the Pitts and Spitts. Yes, these statements about MAK do not mean that MAK is the king of pellet smokers, no, my point is that MAK is dialed in because of how it came into existence, other pellet grill companies may have a product that puts out beautiful smoke, but in my opinion they are fortunate that it all worked out and came together, because looking at the current lineup of pellet grills on the market that is clearly not always the case.
2) I think another major benefit that MAK has is that they do not use a smoke stack. The only way the smoke can escape is by seeping out the sides/top of the lid, or by exiting through the lower vents that are at or below the cooking grate. MAK is not the only player on the market that is designed like this. For those companies that produce pellet grills without a smoke stack, if it is done right, I think it definitely makes a difference in the products end result. I used to have an old school US made Traeger. It actually produced quite a bit of smoke. Comparing the food from that Traeger to what comes off of my MAK is like night and day, IMO. Although the old T smoked like a locomotive, the smoke rose and quickly escaped through the stack. It was not forced to sit around for a minute and slowly seep out through the small side venting of the lid and/or lower vents.
So as to the question of why does MAK out-smoke much of the competition... these comments were nothing more than my thoughts and opinions. There are lots of other pellet grills that do a fine job and put out a fantastic end result. I just feel that there are just certain things that can be done that truly do set one product a step ahead of the competition. MAK is not the only one, but it definitely is one company that has done a few things right. Have I had issues with my MAK that I’ve had to work through? Yup! There is no PERFECT pellet cooker on the market... at least not that I know of... and if you happen to find it... please let me know. I’ll make you a good deal on my MAK... lol.