i have also owned a roadster, as well as my new coupe. The roadster is a blast, I live 20 minutes from the beach In S. Cal. and there's nothing like a ride up the coast with the top down or cruising around the beach towns.
The only little difference between them as far as i see is...

The roadster is not as quite, even with the top up, not much, but the coupe is a bit more sound proof. Also i was not to crazy about the steel beam that is attached to the rag top. it comes together when you close the top and attaches to the top of the window frame. Its right in line with your forehead, should you hit something head on, you better have your belt on. A safety belt is a must in a roadster, (common sense) besides the chance of flying out in an accident. I'm only pointing this out. Not wanting to bring any one down. As I said roadsters are great. in fact if i did not own an SSR Chevy roaster pickup. I would consider one as a second car. Bottom line buy one or the other.