Septoplasty or Rhinoplasty by an ENT Doctor?

Choose a surgeon who specializes in nasal surgery. It is important to realize that not all plastic surgeons, nor all ENT surgeons, routinely perform rhinoplasty in their practices. It is imperative to find one that does. Rhinoplasty takes considerable experience and training to get predictable results. Inquire about what percentage of the doctor's practice is devoted to Rhinoplasty.
Your rhinoplasty surgeon should be Board Certified in either Plastic Surgery or Otolaryngology (Ear, Nose, & Throat Surgery). Not all "cosmetic surgeons" have completed the rigorous training that is required to become Board Certified in either one of these specialities. It is important to find a surgeon who understands both the aesthetic (cosmetic) aspects of nasal surgery as well as the functional aspects.

Murad,
Septorhinoplasty surgery is one of the areas that ENT and plastic surgery overlap. Both specialists are trained to perform both of the procedures and you may get a great result from either. Remember that there are risks to the surgery no matter who performs it and you should have a discussion with your surgeon/surgeons about the different risk set that secondary (second time) nasal surgery brings to the table. Good luck!

Patients are generally best served when their doctor is the most specialized and the most experienced. The principle is universal, whether you need a hand surgeon, eye surgeon or gall bladder surgeon.
You need to inquire as to how many combined rhinoplasty and septoplasty operations the doctor has done in his career. If he is board certified and has completed a fellowship that emphasized nasal surgery, you will be in good hands.
You need to ask those questions. Then, look at the doctor's before and after albums and speak with -- and even better-- meet with the patients who have had a similar operation.
Also, is the visiting doctor who comes " twice a year" going to provide all your post-operative care? Very important.
The more homework you do, the better the chances of success.