Saline breast implant or silicone implant

Hi, I am 24 years old girl. I am doing my graduation in fashion technology. As you all know fashion is a place where lot of comparisons take place. And now I am a metric for everyone. Actually, my breast size is too small as compared to everyone else. I asked my aunt who is our family doctor about my concern. She told me that I may be affecting from a medical condition named as micromastia, where breasts do not fully develop after puberty. And at times I am embarrassed to stand up and speak to, as I am concerned about my appearance. One of my friends suggested undergoing breast implant. But I am confused between saline breast implant and silicone implant. Which will be better among both? I am planning to visit a clinic in London which offers both the implants so that I can get more about the implants. Before in hand, I want to know what kind of questions, should I ask to my doctor before the implant procedure? It will great if you can share your views on implants?