I prefer real, but I have nothing against saline/silicone enhancements. It's not my body, it's hers. It comes back to size, though. Some of the aftermarkets are just too huge. They don't look anywhere near normal or real.
Best original equipment? I don't know...LucyNova, Bijou, Marie, Morgane, Monica Scott, Natali Blond.
Best aftermarkets? Maybe Sharka Blue, Sendy Silver, Marta.
I could add to the lists, but there are so many lovely women here it's hard to narrow it down. It's all a matter of taste, and I need to taste them!