After root canal treatment the tooth becomes brittle and crown is must to protect the treated tooth from occlusal forces while chewing.and if the root canal is been done properly and if u dont have any complain with it why you want to extract the tooth?
Next Steps
go with crown and save the tooth dont extract a natural tooth,always prefer to save a natural tooth.
Health Tips
dont bite hard food with the root canal treated tooth until crown is been placed otherwise it will fracture