It’s not only price. The dealership has more training availible to them. The indie does also but not as much. But with that said it also has alot to do with having a sharp tech.
Dealerships do not always insist on using thier parts. One qouted me a price on thier brand and I asked them to qoute aftermarket. They said they only use O.E. and so I asked them “you want to make a sale or not”? Aftermarket was installed.