iPhone Duo: Pre-Orders Are Open, But Which One Would I Choose?

Apple's first folding iPhone is finally available to pre-order, but at £1,999, choosing one isn't a decision to make lightly. I'm looking at the 256GB model in Star White, wondering whether that enormous inner display could replace my iPad, and exploring how Mous is handling protection while its finished cases are still being developed. Here's what excites me about the iPhone Duo, what gives me pause, and the configuration I'd choose.