Anything that´s proportinal to the body is fine by me...that leaves enough margin to include most real and fakes (im not that good at judging proportions ^^ )
There comes a time when the Extra-Large Breasts get in the way of numerous activities. Real Breasts are more natural looking...but strictly from aesthetics...I don't like large breasts...fake or otherwise.
Being a woman, I don't care, but every man with whom I have discussed this issue says he prefers REAL breasts to fake ones, no matter what the size is.
I prefer real (and flat-chested, if that's what real is) to fake of any dimension. My only contradiction to that opinion is if SHE really wants enhancement.
If implants are under the skin, the tits are real.
fake tits fall to the floor when the top comes off.