Mostly mono tracks, but some stereo for stuff that have stereo efx involved. Sometimes it will be dry up the middle on a mono track with effected tracks 30% panned L/R. We will always run multiple mics and tracks. Its kinda a PITA to mic up, we usually have to make compromises with mics because while I have a killer mic stable, I don't have 2-3 of all the mikes and the really good mic pres's for each of them... So we have to place them where they are gonna matter the most.
Sometimes we try stuff and go backwards in the mix, but sometimes it works out nicely, it really depends on the song..