The TST/Norwalk are still super playful skis, though a little bit less so than the JJ. Norwalk obviously has More purchase throughout the tail, and just a touch more stability at speed (neither are speed demons). Both still want to arc across the fall line, though the norwalk less so. Both are very good in tight places, but JJs are better. Both are good in moguls for their width range, Both are decent in chop and Both are light as a feather.
Deciding between the two can be difficult (i guess?) since both are extremely fun skis. the main thing to think about is preference, Do you want tail rocker/shorter radius or not? thats it.
If you dont have a larger quiver to address different scenarios, than the Norwalk would be my choice. Its still playful and snappy, but can handle speed a little bit better.