In reply to Boulderdash86:
I would go for Ice Flutes virtually every time; I wear mine on a bandolier. Don't like the Grivels, they don't seem to hold any but the longest screws as well and are a bugger to get attached to your harness or bandolier (threading the neoprene strap through the simple buckle requires the strength of popeye and the patience of a saint). I do have one Grivel which is better than a flute for a 22cm screw.
It is, of course, a matter of personal preference, I suggest you see if you have a mate who can loan you one of each to try out at home (or even on Stanage to confuse people!). If you can't get on with either or both of them in ideal conditions then you have no chance when trussed up in winter gear and miles above your last dodgy screw.