I think the DMG will probably contain some advice similar to that in the 3.5 book Dungeonscape, where it states what types of terrain each of monster typically prefers, as well as which type of allies best support it.AllisterH said:So, assuming you have a standard party of fighter, cleric, rogue and wizard, what do people think would be a balanced encounter in terms of monster role (I imagine 4 equivalent level Brutes against this party in a open stadium is just asking for a TPK for the party whereas 4 artillery guys at range will make hash of the party as well).
Basically the advice Dungeonscape gives is to pick a role that you want to be the focus of the encounter and then add monsters and terrain to support that role.
So if you wanted your focus to be artillery, you might add soldiers or brutes to serve as blockers. If brutes were the focus, you might want some skirmishers or artillery to distract PCs, or a leader to buff them all.
I don't think there's any single answer to "what monster group is best", but it depends on the PCs, the terrain, and the individual monsters.