Results and saftey
This is the most important deciding factor. You must ask the surgeon/assistant to show their results and their past track record. A good center should show you multiple before after pictures.Also insist on viewing videos and testimonials as pictures can be morphed.
Talk to or meet previous patients of the center
Ask for phone numbers of previous patients who have undergone Hair Transplant with that particular surgeon/team (RESULTS VARY FROM SURGEON TO SURGEON). Request the center to arrange personal meet-ups with previous patients if possible. A good and experienced surgeon/center should be able to do this.
As Hair Transplant is a surgery, there is always a risk of infection. So check the hygiene and cleanliness of the center and the operating room. Go ahead with the surgery only if you are fully satisfied.
Ask specifically for the surgeon who is going to operate on you. Insist on results of that particular surgeon only. Most Hair Transplant centers have either only visiting or under-qualified doctors. Centers may show you results of other surgeons who may not be visiting that facility anymore so be very very specific. It cannot be emphasized more that results depend only on the SURGEON and not the building, equipment or technique( A good technique if done poorly will give poor results)
Type of Facility
It is always better to go to a center with full-time hair transplant surgeon(s). This will ensure that you get the same surgeon, everytime you visit for a follow-up. It also attaches a better patient-doctor relationship. It also ensures that you get the best cost of hair transplant with that particular surgeon. Usually, a facility which is directly owned by the surgeon, will give you the best price for hair transplant.