Looking at your photograph, I would recommend liposuction with an added energy source to help with tissue tightening. I advise all my patients that while a tummy tuck will give you the flattest possible abdomen and help with your feminine curves by doing an internal muscle repair, you must be willing to accept the scar. Take some time and look at as many photographs as you can to get an idea as to what a tummy tuck scar looks like in the best and worst cases. It is a mistake to assume you will have the best scar as all patients heal differently and even in the best of hands you cannot predict how a scar will heal.
The advantage of liposuction is that you will save yourself this scar and the recovery is usually easier. While every case is different, in your particular case, you should also consider adding an energy source such as ultrasound (VASER) or laser (my preference is SLIM from Palomar) to help tighten after the liposuction. After liposuction with proper diet and exercise you should do extremely well and have the abdomen you really want.