Yes, especially the 90-mm guns. Even if the armored division being supported had 76-mm tanks those were still a minority in the tank companies whereas the TD platoon were at least armed with 76-mm weapons. There was a late Autumn engagement between the 2d Armored Division and the 9th Panzer Division, and the Americans said over half of the kills went to the M-36s supporting the tanks with their big 90s. This action convinced the 2d AD tankers that they needed more firepower above all other considerations. There were also training. Tank Destroyer crews were very well trained compared to average separate tank battalion or even armored division tank crews. On a side note, Steven Zaloga claims that in Armored Thunderbolt that Bradley ordered all tungsten carbide tipped rounds in the 12 Army Group to be distributed equally between all tanks and tank destroyers. The overall number of rounds issued per crew was still minuscule though.