A well-done root canal is superior, by far. Never give-up part of yourself for a piece of titanium. Normally, your teeth are placed in their sockets with a joint-like ligament. Why? Cuz, you want stress relief (for both the tooth in question and the tooth in the opposing arch). An "osseointegrated" implant cannot match this mechanically, since they are in close contact with bone. The Branemark system I used to know supposedly used Titanium for this reason, but I think the osseointegration story has not held true. Most dentists would opt for a root canal first, and the implant second. Obviously, I'm giving you generalities here; but usually, dentists will try to follow a certain logical sequence of treatments, putting the least invasive procedures first.
Your question reminds me of the old days, when patients used to ask me whether they should get dentures or try to keep their teeth. Well... I tried to maintain the quality of their lives, and no way was a hunk of plastic and porcelain going to serve them better than the original... no matter how many restorations the original needed.
If you think the implant will free you from problems, guess again. Your problems will be magnified.
But if you chose to line some dentist's pocket with your $$$, go ahead, get the implant (although most dentist would not recommend an implant for a single tooth replacement -- I suspect you're considering a bridge abutment??)
Regardless, I'd go with the endodontic approach FIRST. It is FAR LESS INVASIVE.
Edit - Bobbyjack... I'm on the admissions committee of a prominent dental school and we never take med school drop-outs. We also try to keep-out anyone that plays the acoustic guitar... Don't ask me why. LOL!!!
:-)