hi matt
personally i suffer a bit from cold feet so bearing that in mind i would use them for sub 4000 alpine mountains where rock will scrambled aswell as snow ice,( i.e cosmiques arete, dent de geant(no rock shoes needed)or on VF scrambles in dolomites etc, if its a pure snow ice route then i would tend to use mt B3 boots(aig d'argentiere, tacul, etc)
for me same thing in the gorms in winter i tend to use my B3 boots, as weather can be more inhospitable, but if it was shaping up to be a nice day and the plan was walk in the corries easy gully up and out for a nice walk across the tops in sunshine, i would use them, but generally i play safe and use my B3's,
my light boots are sized for a thinner sock though too, so that dictates, as i use it as a technical scrambling type boot, if i was to get something modern for scottish gully and mtn walking, i.e. a lighter scarpa manta then i would look at scarpa mirage type product for better tread and warmth over trango s
if i had shares in vibram i would have about 5 different mtn boots, but i have 2 and use accordingly
hth