Single stage VS B/C

I love to listen to the different thoughts. I bought single stage for my Barracuda and the guy I was going to let paint it had an absolute fit! Said he wouldn't spray the car. I just finished the interior with the paint and it looks awesome. I'll do the outside in the spring. He said single stage paint will not hold up.
My Barracuda sleeps in the garage, so I think she will be just fine.
Some of the videos I watch tell newbies that base/clear is the only way to go. I'm not a professional painter, I just know mine turned out really nice.