You can cook using more air in an Acorn with a pretty simple mod of the intake which allows the exhaust to be ALOT more open than without the mod. Works very well, Smoke Ninja bought mine and hasn't had a problem doing lowNslow or high heat cooks. But you will not burn enough coal/wood to get a heavier smoke flavor since it burns less than 1/3 the fuel compared to a UDS.
Using a UDS, if you have enough intake and exhaust, you can very easily control your temps to where ever you want. From 150* to 750* plus. And if wanted you can burn straight wood with the right size splits, but you will have to tend the fire going that route.
I'm still experimenting with my horizontal UDS. And I really like the ease of use and clean out along with grate areas. To see what difference one taller exhaust would do, I added a 12" section to the rear exhaust. Holy cow! I could not keep my temps below 350*, where with out that added extension, I would run 180*. The extra draw made to drastic of a change, I'm going to cut that 12" extension down to 6" and see what that does next.
If you have any specific questions, I'll be glad to help where possible.
http://www.bbq-brethren.com/forum/showthread.php?p=3134109&posted=1#post3134109
http://www.bbq-brethren.com/forum/showthread.php?p=3410813#post3410813
http://www.bbq-brethren.com/forum/showthread.php?t=181570&highlight=uds+intake