I used to say that if you didn't use wood, it wasn't BBQ, mainly due to experiences cooking on other cookers with lump alone. Slow Minion burns are a different story, though, and some of my best chicken has been smoked with nothing but lump and maybe one chunk of cherry. But different bags of lump smoke differently. Regarding BBQ, since the weather was really foul on my last butt cook, I used a briquette, B&B Oak. I didn't have to use nearly as much hickory since the briquettes seemed to smoke a bit most of the cook. I'd rather that they burnt cleaner, but they lasted longer than any other fuel I've used. Whether I use water or not and how much it steams is also a factor. The more steam, the more it cleans up the smoke. One reason why I prefer water for poultry.