For the grill or the smoker, lump gives a better taste, longer and hotter burn. I use it build the coal bed in my stick burner and then cook with splits.
Now, for dutch ovens (DO), NOTHING beats the consistency of Kingsford K charcoal. It some of the most consistent stuff in the world. We have tried every brand, from generic to every name, and we always go back to Kingsford K. All briquette charcoal lacks longevity, but for most DO cooking, you only need 2 hours at most (The exception is beans, which obviously need nearly all day). Two rounds of chimney lit Kingsford will get you through a two hour cook on the DO. Everything else, who knows what time you will get, as it almost seems to vary briquette by briquette...
Willieboy - Big Steel Keg (coal burner) + Old Country Pecos (offset stick burner) - Tomball, TX