Canadian seeking breast augmentation either in Canada or USA

Board Certification is the litmus test for well qualified surgeons.  Finding a Board Certified doctor closest to your home would be my suggestion. 

You will find equal expertise on both sides of border.  You should consider your need to have follow-up visits and choose a location that is more convenient for travel.  You should also consider the remote chance of an emergency during/after surgery that would likely be covered financially by your health insurance in Canada but not in the U.S. ($$$).

Thank you for the question. I think that you'll likely do well either way, assuming you select your plastic surgeon very carefully. You will want to make sure that he/she has significant/demonstrable experience achieving the types of outcomes you will be pleased with.   In other words, ask to SEE lots of examples of their work AND preferably speak/see patients who have had similar procedures done.  Then, careful communication of your goals will be important as well. In my practice, I find the use of goal photographs and computer imaging very helpful during the communication process. You may find the attached link, helpful to you as you learn more. Best wishes.