For reference, the Infraction is 695mm x 310mm. The Limitless V2 is the same size as the smallest of the three options here, at 730mm x 312mm. Both Limitless V2 and Infraction wheelbase is 406mm, same as all three of these.
Stretching it longer but keeping the same 406mm wheelbase could look a bit odd, even with greater width. Mind you, looking at the body options in the other thread, compared to wheel placement on the Arrmas, I can see where the extra length is needed.
Bottom line, for broad body compatibility with arrma and after market for their cars, I'm voting for the shorter one. Same size as the Limitless V2 seems like a good move.