I like a cutaway (prob a semi-cutaway). The archetypal English look.
I buy these for all sitations - I like the sharp look of a cutaway - even in casual, to me, any other collar looks sloppy and looks wrongly proportioned.
There seems to be a thing whereby they are regarded as formal : a semi-cutaway's points also stays out of the way of your neck under a crewneck, and in general, the points don't seem to crumple against the bottom of your neck.
For me, the...