Seems back in the day after trying both, the factory teams favored panhard over the watts if I remember correctly, for what's worth, and not sure why.
That does seem an odd choice.
DynoDave Walter P. Chrysler Club - Great Lakes Region Member # 12304 1970 Plymouth Duster 1972 Dodge Charger Rallye https://wichargerguy.proboards.com/ 1977 Chrysler Cordoba