I think they wear the same....... I just watched group A' cars after finish the race 45 minutes...... tires were unusable for truggies and buggies. They were pro line bow tie and crime fighters tires.
However, if you chose bigger threads ( like pro line's knuckles ) for tire saving reasons ....... I think you should buy truggies because it's gonna be easier to drive than buggies with pro line's knuckles.
BTW, more people are racing truggies than buggies now..... well at least in my country now.