Xtra smooth or regular smooth? Is there high chance for my petite frame to get rippling with regular smooth high profile?

Xtra smooth moderate profile implants produce just as natural a look as the regular smooth moderate profile implants.  The Xtra implants, however, have less chance having wrinkles due to the implant.  The Xtra Mentor moderate implants are idea for the athletic build or someone who does not have much breast tissue of their own. The choice of using the high profile implant, whether Xtra or regular, depends on the final size you desire to go to and the width of your breast base.  A narrow chest width my require high profile implants which have a narrower base. Dr. B.

Hello,
Your surgeon is recommending a ball shaped implant to give you the most volume. This recommendation is based on wanting to give you the biggest implant possible, but relies on incomplete biodimensional analysis that only looks at breast base width, and not more important criteria like tissue stretch and nipple to fold distance. You will end up looking like you have balls on your chest, and also rippling. You may be a good candidate for appropriately sized (likely smaller) shaped and textured implants. Go visit a few ABPS certified/ASAPS member surgeons who specialize in breast surgery and is experienced in shaped devices. 

Thank you for the question.  Ultimately, careful communication of your goals (in my practice I prefer the use of goal pictures, direct examination/communication in front of a full-length mirror, and computer imaging) will be critical. 
 I have found the use of "higher profile" breast implants very helpful when it comes to achieving very nice outcomes for patients with small frames. Many of these patients, despite their very small frames, do wish to achieve a relatively full look (relatively large volume for their small frames). In these cases,  a well executed procedure and selection of appropriate breast implant size/profile is not necessarily associated with more "negative outcomes" than the use of lower profile breast implants.
 On the other hand, every patient undergoing breast augmentation surgery should understand that their anatomic starting point will limit the outcome of breast augmentation surgery.    In other words, a patient's starting anatomy will limit how large of a breast implant can be utilized safely. The use of a larger breast implant(than what is safely "allowed" by the patient's anatomy) can be problematic;  potential problems include breast implant displacement/malpostion issues ( such as bottoming out, lateral displacement, symmastia...)  and/or significant breast implant rippling/palpability.Generally speaking, palpability and rippling of breast implants may be related to several factors. These include the amount of soft tissue and breast tissue coverage over the breast implants, the position of the breast implants (submuscular versus sub glandular), the type of implants (saline versus silicone), and the degree of overfilling of saline filled implants. Generally, weight loss will extension weight any rippling/palpability of the implants.  ***Given your concerns, I would suggest that you schedule additional time to spend with your plastic surgeon communicating your goals, preferably prior to the date of surgery.
I hope this helps. Best wishes.