A mustang is a performance car. All SVT Cobras come with sticks. With a stick, you drive the car. With an auto, the car drives you. Learning to manipulate a stick will make you a better driver. In some ways your dad is right. In this age of heavy traffic and poorer drivers, the auto is easier to drive and maybe more resell able. That said, you need to be able to drive a stick. I start my kids out on autos because of they need to learn to drive first. Once they have mastered staying in their own lane, throttle and brake manipulation, I teach the stick. If you get an auto, DO NOT become a two footed driver. The right foot operates gas and brakes. Never start braking with your left foot. You will be ruined for learning a stick.
Cruising the misinformation superhighway in a Terminator.