Hi there!
I think it is hard to say what is best, as it depends from person to person. I was involved in a car accident over 20 years ago and had 4 front lower teeth half knocked out. The dentist root canaled them and put crowns on them. Never had any problems until about a years ago, one of them had an infection under it. THe endodontist retreated the tooth, but I won't know if it worked until January, when I go back. The tooth never bothered me, so I didn't have pain. Ever since they did the retreatment, it never felt completely right, but not painful. So, I don't know what the long term prognosis will be. If I were to get another root canal I would only got to an endodontist and not a general dentist. But I have been doing a lot of reading on root canals.. and there is much controversy...
Maybe someone else will come along with more insight!