I've always preferred natural boobs, but i'll take fake boobs over no boobs anytime.
The first sp i ever saw had 'A' cups. However, they were among the grossiest boobs i had ever seen! They were droopy with cellulite, and the girl herself was shy about removing her top. I've also met 1-2 more sps over my lifetime who's boobs looked like hers. When that first girl told me "I'm considering getting a boob job", i couldn't help myself but to tell her "you should."
I've also been with women with big droopy boobs. At times, i swear they drooped right down to their belly button! A boob job would also be a good idea for these women if they want to improve their overall physical appearance. It's a fact.
For me, a natural 'B' or 'C' cup is unbeatable when firm and the girl maintains a good shape.
And even though i've never been a fan of fake boobs, two of my all-time favorite sps had fake boobs themselves. One of them, i must admit, had perfect boobs and almost felt natural when i'd sample them. The other, i didn't really like her big boobs on her skinny frame, but i eventually got used to them and when she gained 10-20 lbs, she looked great with them!
And finally, i will never be a fan of grotesque big boobs. I mean, it has to still look somewhat natural. When they start looking like beachballs, this is where i draw the line. As one girl who had them done once told me: "For the life of me, i don't know what goes on in their heads when they mutilate their bodies so much."