Granted, both cars have evolved from their early days of pure muscle into sleek and capable sports cars. For the first few decades of their lives, both cars were good for straight-line acceleration and loud rumbling exhaust notes, but not much else. But Americans have flocked to muscle cars and customized them, raced them, modified them, and loved them since the early 1960s.
Then something happened. Rather than fading into the annals of history, the muscle car grew up and started to take on characteristics of European sports cars. By 2015, muscle cars were being compared with the likes of the BMW M3.
Then the utterly remarkable 2016 Camaro came along and officially ended the muscle car era. The new Camaro has left the Mustang reeling in a pile of obsolete dust and forced Ford to figure out how to catch up.