Best crown for a RCT front tooth?

I recently had a root canal on my front tooth because it was knocked out. My dentist told me it will likely darken over time and said she would use a zirconia crown since it will block out the darkened tooth. I've read they're very opaque and not ideal for front teeth. Is this standard for a front tooth with a root canal? Or can a porcelain crown cover a tooth well even IF it does darken? I hate to question the skills of the dentist and lab but I've read porcelain is commonly used for front teeth.