Dental implants are fantastic, but they are a close “second” to your natural teeth. The question is more about “restorability” of your remaining tooth when deciding whether to have a root canal and keep your tooth, or to extract it have a dental implant replacement.
Too often I see root canals done on near hopeless teeth. They have a crown made on a hopeless tooth, and it falls out or fails very prematurely.
That in my opinion is just not right. You may have invested $2000 -$3000 for the root canal, crown, post and build up only to have it extracted in just a few years!
When your tooth is badly damaged, the cost of a dental implant makes a lot more sense than having a root canal and crown on your tooth that does not have a good long-term prognosis.
It is better to extract it and place an implant which is far cheaper in the long-term than a root canal and crown. If the tooth is savable with a root canal for the long-term, that is what I would do in my own mouth or my family’s mouth.
If your tooth is restorable, by all means have the root canal. If not, the cost of a dental implant makes more sense in the long term. It does not cost that much more for something that will probably last your life.