Well! I've just gone through the process with my commercial wit over the last few months.
Neither need cooking as they are heat treated and the gelatinisation temp of wheat starch is pretty low anyway. I ran them both through the mill though.
Torrified wheat lends a very distinctive 'breakfast cereal' flavour and aroma, some off-putting sulphury notes (that fade), but great residual wheat haze and outstanding foam. Rolled wheat produces a beer with a dry and soft mouthfeel, excellent fresh wheat flavour and seems to aid in the development of Coopers-like esters of pear and apricot when using WLP400. I'm sticking with the rolled wheat; much more like Hoegaarden, but I will sneak some TW in there too to funk it up a bit. And to use up the 100kg I have left...
EDIT: I used TW and RW at 25% with equal amounts of malted wheat.