Thank you for your question. I don't have any experience with Nagor or Arion, however I have a lot of experience with the big 3 in the USA which are Mentor, Allergan and Sientra. With the three popular US brands I don't honestly believe there is a big difference between them. It is really comparing apples to apples. Most surgeons will use one brand as their primary brand so they order enough they get better pricing. Buying 1/3, 1/3 and 1/3 really doesn't get you the buying power that 9/10 does. In addition the customer service and how easy the companies are to work with goes a long way. I don't think one brand is "better" than another, it comes down to the surgeon's comfort, preference and pricing. You should have a consultation to determine what your surgeon thinks is best for you. Best of luck.
Of the three that you mention, Mentor is the most commonly used in the United States. The big three often used in the US are Mentor, Allergan, and Sientra. The implant selection should be based on a combination of your desired size, soft tissue dynamics, breast base diameter and skin elasticity. I recommend an in-office examination as well as a detailed discussion with a surgeon who you are comfortable with. Finally, make sure your surgeon is a Double-Board Certified Plastic Surgeon certified by the American Board of Plastic Surgery, a member of the American Society of Plastic Surgery (ASPS) and the American Society of Aesthetic Plastic Surgery (ASAPS).Best,Dr. DesaiBeverly Hills Institute for Aesthetic Plastic SurgeryHarvard Educated, Beverly Hills & Miami Beach Trained, Double-Board Certified Plastic Surgeon