Nipple incision vs crease incision? What are the pros and cons of both? I'm going for 500-700 cc.

The periareolar incision (nipple) heals quite well however is associated with a higher incidence of capsular contracture, which is a type of scar tissue that can form around breast implants causing them to become hard and distorted. The inframammary incision (crease) is hidden in the breast fold and has a much lower incidence of capsular contracture. If you are planning on future pregnancies and breastfeeding, the inframammary incision will not violate your milk ducts and breast tissue as the periareolar incision can. You can ask these questions during your consultation and your plastic surgeon will be able to go into much more detail at that time.Best wishes,Dr.Bruno

Nipple areolar incisions can work well in patients with an areolar diameter that can accommodate the size of the implant to be inserted.  It is easier if those patients have thinner natural breast tissue mass as the tunnel is not so long.  It can also make for a less obtrusive scar when patients lack a natural well defined IMF.  There is some suggestion that infection rates and breastfeeding issues are higher with incisions in the nipple area.
I personally favour a IMF (fold) incision in most patients.  The incisions and scars are well hidden in the fold in most cases where such a fold exists prior to surgery.  One can completely avoid the breast tissue and this can impact breast feeding and infection rates.  The fold accommodates a wide range of incision lengths well.  In the case of any complications such as infection, bleeding and capsules, it is easier to manage through the IMF approach.
In your particular case, a 500-700 cc implant is on the larger end and generally requires longer incisions.  This is generally better in the IMF in most patients.  I personally use Keller funnels to minimize incision length.  There is some suggestion that forcing implants through too small an opening in the breast can weaken the shell and lead to premature implant rupture and failure.
In the end, if you heal extremely well, it does not really matter where the scar is positioned.  If the scar is destined to be red or hypertrophic for a while, then an IMF location is the best hidden until things settle down.