Chevy by far
Richard Petty won nine Nascar Cup Series races in a Ford. They were all during the 1969 season.
Darrell Waltrip has 84 Nascar Cup Series wins and 13 Busch Series wins.
Greg Biffle has 16 nascar cup wins.
Kyle Busch has 40 Nascar Truck Series wins in his career.
Chevrolet currently holds the most wins in NASCAR's divisions. They are still the most dominant auto maker in general.
Kyle Busch has 65 wins in the Nascar Nationwide Series, which is a Nascar record. It was formerly known as the Busch Series.