Good luck in your search, you will probably have to travel to get what you want. I have an 07 limited convertible. The limited models have more standard options . Speaking of options that's what the convertible gives that the coupe doesn't , top up or top down.
I've had several convertibles this is the quietest one , no rattles and low wind noise . The coupe I would think is more quieter and chassis maybe feel firmer . Either way you can't go wrong take you time and do the research.