Unless the D3 expects to sustain its business on a nostalgia-based model (not likely since it is mostly niche volume) it needs to find a clean break from its past and the baggage, fair and unfair, that ladens it.
It's kind of like asking whether you would rather stock your video store with Beta vs. VHS machines. All 3 cars look great but their beleagured manufacturers run a risk of further defining themselves by their heritage of a bygone era. Anyone who reads these message boards have heard ad infinitum the canard about the D3 being nothing but a manufacturer of gas guzzlers. While the D3 product line does not extend as far downmarket as others (nor as far as it once did) the reality is that their products are every bit on par in fuel economy in those segments where they directly compete with foreign manufacturers yet this long outdated perception persists like an unwanted guest. It's great that there will be a Camaro model rated with 29 mpg highway but it won't likely matter in the biased eyes of today's market, even as the Scion xA and Honda Fit get replaced with larger models in the last year or so and Hyundai rolls out a V8 for a midsize sedan.