I live on Canada's east coast. Top down driving for eight months out of the year. Shared with my MGB. They're both daily drivers for those eight months. Stored in the garage from Dec-Mar incl.
Get the vert. There'll be no problems in the winter if you've no salt on the roads to contend with.
A plus is that they look better than the coupe, even with...actually, especially with the roof up.