The butyl was used from the factory with windshields that had gaskets. Urethane was used on newer vehicles. The problem with butyl it is not an adhesive only a sealant so won't hold the windshield in place as well in a crash. But if you get hit that hard it's probably all over anyway.
The Napa 4203 is made for sealing windshields. It cures soft to be flexible with the gasket.
Weatherstrip adhesive is a glue only, it doesn't have any body to fill any gaps.