In reply to WB101:
yeah, pretty much what they said - except i find petzl screws the devils work. a far far third place.
i like mostly expresses with a couple of grivels for difficult placements. i do find grivels nicer to start, but offset by the hassle racking and price.
i agree heartily with shorter screws - so long as they have the same amount of thread as the longer ones im happy (theyre all psychological anyway). grab a few long ones and the obligatory 22cm, but the shorter side of middle saves a lot of weight.
i went with flutes for a few seasons and while they had several pros, stopped using them in favour of a better clipper method. flutes are easy and safe, but heavy and a pain to set up. the bandolier system i found woeful (but maybe just had it wrong).
clipped straight to the harness i found they sat too high, and the logistics of setting them up was too much for on the hill, so negated wearing my harness for the walk in.
if theres a better system im up for it....
now i rack bigger screws on one clipper, smaller on another, then on the other side a dedicated 22cm with threader and 2 or 3 longer belay screws. on long routes i add another clipper full.
each clipper (petzl, never BD) holds 4 or 5.
make sure you rack them so they hang teeth out - saves your expensive softshell pants and potential to have children.