Originally Posted by bobbrews
Briess has a higher sugar content than Muntons. To see for yourself, build a recipe using hopville. A balanced recipe with Muntons will be unbalanced when you swap it for Briess. I prefer Muntons because you have more flexibility to convert more sugars from grain if doing a partial mash.
I'm pretty sure hopville is wrong on this: I noticed the other day when I built a recipe with Briess, but the LHBS only had Munton's. So I bought it, and everything changed in hopville. I noticed that it lists the PPG for Munton's at something like 35. I asked a few people, read around, and any kind of DME should provide around 45 PPG. Changing the default PPG value fixed the gravity values for the recipe.