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I don't have a UDS but a WSM is basically a PDS (pretty drum smoker). Just depends what you can afford. In the Spring and early summer holidays, KBB is 25 cents a pound or less. In my area I've never seen RO lump for less than 65-70 cents a lb. I've used both. Prefer KBB.
Only use k ingsford for grilling since there's to much ash for long smokes. If your talking royal oak briquets, I prefer Stubbs, for price vs weight. Longer burn time and less ash. When stubbs is out of stock I opt for royal oak briquets. I don, t look at price vs dependability when it comes to long cooks.jmho