Tummy Tuck gives more substantial results

Skin tightening technology based on laser or liposuction techniques (laser lipo, ultrasound or regular lipo) may make small differences in skin tightening.  They have the advantage of being quick with minimal downtime in comparison to surgery.  There is significant marketing pressure from the manufactures of many of these laser technologies so you have to sort through some of that.

Abdominoplasty on the other hand can make a significant difference in your abdominal contour by addressing significant amounts of excess skin as well as tightening your core abdominal muscles.  The trade-off is requiring a general anesthetic and having a significant scar.

Typically patients with significant excess skin require an abdominoplasty.

I hope this helps.