Re AR - I'd prefer 16:9, but not at the expense of reducing the overall PQ by either cropping or stretching.
It's a shame that you don't have the option for both, but if it has to be one then I'd stick with the OAR.
In general, with CBSD in control of the S3 set then I'm hoping for the PQ of S1, with no audio screwups this time.