Personally? Prioritize:
1. GC VC, as it's never before been a VC platform.
2. Platform quantity. NES, SNES, N64, GC, Wii*, GB, GBA, DS, Master System, Genesis, Saturn**, Dreamcast, Neo Geo, TurboGrafx-16. Even if it's like two-five games each, show that it will be a massive treasure trove of systems.
* Wii depends on how they'll do it. I guess since it's new tech, they'll have to emulate it this time, and they should be able to pretty easily if they get GC working.
** Saturn depends on emulation possibilities, as Saturn was very infamous for its VERY complex tech, with it having I think 2 CPUs and 2 GPUs. Dreamcast should be doable if GC is.