Besides a larger incision site what is the difference between open hernia repair and laparscopic hernia repair?

Lap is from behind. The open approach is an anterior approach or one that repairs the hernia through the skin incision above the hernia. The laparoscopic repair is a posterior approach to the hernia . This technique from behind the hernia inlapherently has the advantage of a wider overlap of patch material which yields a lower recurrence rate in many cases.
Incision site. The incision site and approach is the main difference. A laparoscopic repair is done with cameras. The hospital stay and morbidity is about the same between the two approaches. I would personally prefer a laparoscopic repair if eligible - your surgeon will determine if you eligible for that approach.