Natural is better.
London, while I have not examined your chest, I would suggest that natural is still better.
Instead of implants, would a lift or other procedure ward off the gravitational pull of Mother Earth?
In my limited experience (probably under 100 pairs of breast examined, less than 25 pairs examined closely and with serious manual inspection), natural are much better.
For me, % of natural to enhanced is 95/5%, but I probably choose them that way also. So, a very poor sample choice to base any results on. Do I choose them (ladies, not the pair of boobs) by enhancement versus natural? Probably not. Rather, the kind of lady who attracts me is not focused on her mammary glands, but rather I am attracted to ladies who seem to have something on their shoulders that attracts me.
One lady who to me shows the attraction of natural breast with a natural sag to them is Fawn. Not a young little 20-something, her breast look quite delectable in her showcase. I have not had the chance to perform an inspection on them, but I can't imagine anyone not finding them quite nice to cup in their hands.
http://www.eccie.net/eccie_showcase....preview&g=3384
(see the second pic in the showcase)