My Fav, that's a hard one, so let's go by size.
Small = Muppy (but I use my 311 the most)
Medium = I have to go with my Mossy/green S5, although the Wardog is coming up fast
Camp size = Bulldog Regulator
Chopper = BWM
The knife I carry the most..... the 311 just because it is SO handy. When walking around "The Great Outdoors", the Bulldog. (and the 311 on the other hip or the Cupidvore).