This whole pellet grills not producing smoke above 250 or whatever is rather off topic so I'll just say one thing about it. It seems to be a myth propagated by people that own other types of grills and want that type to be the best.
Maybe this deserves it's own thread, but I'm really surprised at the amount of misinformation out there.
I own all three types, a BGE, an offset, and a
rt700.
Kamado: I wouldn't put wood in it an run it above 300. It would ignite the wood and run away, or it would burn the wood in a way that would be disgusting. Charcoal adds a bit of flavor with indirect cooking, but it's not really an advantage if you are looking for wood smoke. I like charcoal flavor on things like pork, but really dislike it on things like chicken thighs.
Offset: The hotter you go, the more oxygen you need, the cleaner the burn you get and the less visible smoke you see. It has a slight advantage over pellet grills here because the amount of combustion gasses is just greater.
Pellet grills: Same as above. The hotter you go, the more oxygen you need to use, so the cleaner the burn. You also get less visible smoke here and the myth that you need to see smoke to taste it is where people get this wrong. There are fewer combustion gasses here, so it won't be the same as an offset burning larger amounts of fuel, but I regularly smoke chicken at 325 and on a pellet like hickory, you get a great smoke flavor. At 325, the
rt700 still has MORE visible smoke here than my offset at this temp by the way, so let's just get that myth busted please.
Adding an external smoke generator is just trying to increase the combustible gasses in the cook chamber. It really has nothing to due with fuel vs fuel, just the amount of it. If you added equal, by weight, of pellets to wood splits you would probably have very similar tasting food. You just can't do that in a pellet cooker, because 1. The density (and increase surface area) of the pellets burns hotter than wood and 2. The proximity of the burn pot is too close to the cook chamber to burn the same weight of pellets to splits. 3. since pellets burn more efficiently it would be a waste to burn that many.
If you made an offset pellet cooker that could use the same weight of pellets as you do log splits, you'd have a closer amount of combustion gasses.
That's all just academic. Even with less combustion gasses, one can make food extremely close to an offset with a pellet cooker, IF you are also running your offset with the correct amount of airflow and using similar wood choices. A dirty stick burn will taste smokier. that's not inherently better, but it may be preferable to some. Clean burning stick burners taste quite similar to pellet grills. But there is a small gap. Which I suspect is what external smoke generators are trying to close.