For us, the gorillas would always win, so it would be Pangani. Do both if you can find time though. I will say however, that if you have a good zoo at home, your kids may have no interest in the trails. When my DD was a pre-schooler, she hated the trails. We have a good zoo at home and DD had zero interest in walking around looking at animals while at WDW. She equated it to something she could do at home and did not want to waste time at WDW seeing the same animals she could see at home. When my DD was a preschooler, when we walked the trails, she complained the whole time that she wanted to go back to MK or EPCOT to see Princesses and ride rides. As she got a little older she tolerated it better because I like to walk the trails and see the animals- she did it for Mom. When they started the Wilderness Explorer books with the tasks around the parks, since there are tasks on the trails, she did not complain at all. Your kids may love it- or they may not. Also, if they are a little older, they might really enjoy getting the Wildnerness Explorer books and doing the tasks throughout the park to collect badges.