I know nothing about Dr Aygin, but the other 3 produce very solid results. I’d suggest getting in contact with Fuecapilar to get proposals from Turan & Gur and to contact Bicer too. I have researched these 3 to death and to be honest, I think they are each as good as each other, in different ways. Do some research and decide for yourself whose results look most in line with your thinking. What I would say, is to expect Turan and Gur to be half the price of Bicer, who has put her price up from €1.5 per graft to €2.5 per graft in a short period of time. The other 2 are about €1.25 per graft and can be even cheaper than that, if you let their technicians do the extractions. For full disclosure, I am booked in with Gur and prefer his work to Turan or Bicer, regardless of price.