Really hard to say.
In summer, this baby: Store Midtmaradalstind, found in the Hurrungane massif of western Jotunheimen, Norway (actually they're all in Noreg, sorry to be unpatriotic
)
In winter, it has to be a mountain very close to the last one, and considerably more famous: Store Skagastølstindane, famously first climbed by WC Slingsby. In winter this route is transformed, the glacier climb is soft but always exciting rather than dangerous. The final ice-rimed rock becomes very tricky in places - and that view! Words cannot...
I can't find a decent winter pic, so here's a summer one to give you at least a vague idea:
It's really close, but I think I have to go with those two