The roadster is a lovely looking car with the roof down....If I lived somewhere with a drier climate I'd definitely go for the roadster.
That said I really think the roadster/ hardtop is compromised from an aesthetic viewpoint with the roof up....unfortunately most driving in the UK will be with the roof up (if used as a daily at least).
Coupé is a beautiful car, it's amazing what a difference a well designed roof makes!