Vaser Liposuction or Smart Lipo for Pouch After C-section?

If you are certain that you will have more children, it is better to wait until at least six months following your last pregnancy to undergo cosmetic surgery. The changes in weight will have an impact on the results and you will require a revision in attempt to correct the area. Thus, it is usually recommended that patients who have recently experienced weight loss and massive weight loss (#MWL), pregnancy included, to be consistent at their weight for at least six to twelve months prior any cosmetic surgery. Such will better ensure longer lasting results of the procedure without risking the fluctuation and stretching of the skin tissue. Weight gain and pregnancies following Vaser may affect the long-term results. When you are at a point in time, you are ready to move forward, your board certified plastic surgeon will recommend which liposuction technique will be best for you. 

As long as you realize that the tummy pooch is most likely due mostly to a stretched out tummy wall and muscle separation (due to the pregnancy) and secondarily to some fat excess, liposuction may improve but will NOT flatten a post-pregnancy pooch.
VASER Lipo-selection is superior to SmartLipo in fat removal without destruction of blood vessels, lymphatics and nerves going through the fat. While the VASER technique selectively (IE the term Lipo-selection) shakes fat cells and empties them while leaving other structures largely intact, the SmartLipo literally heats/cooks the fat and everything that runs through it in an effort to tighten the overlying skin. (This has NOT been proven in an objective studies but that has not stopped the company and doctors who purchased this 160K machine from making such claims). The likelihood of skin dimpling and burns appears to be higher with the SmartLipo.

Smart lipo is ok if the area is small and the amount of fat also small.  Anything more substantial you'd be probably better off investigating Vaser.  I suggest consultation/s with ABPS plastic surgeon/s with these skills.