Hi ATIS31,
I would put BA's refreshed product (Thales) ahead of the VS product. However, on a New York run, your chances of getting it are about 50/50.
Currently, all the 747s and the Rolls Royce 777s have the older Rockwell Collins system. However, all the GE-powered 777s (with the exception of the LGW ones) and the new 777-300ERs have the latest Thales system, as do the 787s (and A380s...but that would have to be quite some aircraft sub!).
In order to more or less guarantee the latest product, book the 787 to EWR. Barring any technical issues, the equipment type shouldn't change. If it does, you'll just have to pray BA sub it with a GE powered 777!