If major surgeries have been done and wall hernia is found then which is better laproscopic or open surgery?

Depends: Usually this depends on the size of the hernia, the amount of adhesions, and the type of repair needed (prior mesh? Need more? Prior failed repairs?). All of these questions need to be addressed by your surgeon prior to surgery. If it can be done laparoscopically that would be an easier recovery for you, but again, ask your surgeon.

Depends: If you simply want mesh screen placed over the defect to prevent bowel or other abdominal contents from entering, laparoscopic incisional herniorrhaphy is a good choice. If your hernia is large and especially if you want abdominal wall integrity restored, this frequently requires abdominal wall reconstruction using open surgical techniques like components separation. Discuss with your surgeon.

Depends on goals: It depends on what you want to get out of the repair. Is it for a specific problem like a large deformity, pain, or both? Skin ulceration, difficulty placing an ostomy appliance and limitations of activities are also reasons to repair a hernia. Repair for prevention is also reasonable. Pick a technique that can most likely meet your goals. An experienced hernia surgeon has lots of options.