There's no single answer to whether a Camaro or Mustang is faster. Both car lines have numerous models across different generations, each with varying engine options and performance packages. A high-performance Camaro ZL1 will almost certainly outperform a base-model Mustang EcoBoost, for example.
To compare, you need to specify the exact models of Camaro and Mustang you're considering. Then, you can compare their 0-60 mph times, quarter-mile times, and top speeds, which are readily available online through automotive publications and websites.
