$ RCT vs Crown $ ?
That depends upon which tooth, the type of crown
and the particular office.
Why do you ask? It's not usual for there to be a choice between the two to solve a particular problem. I suggest you: 1. Find a dentist whom you trust. Then, 2. Discuss your treatment options and not only what you should do, but what happens if you don't.
Finally, think long term and not just initial costs. Think wisely.