Can't say anything about the skin pack (didn't get it), but the herbivore pack is... well, it's another dinosaur pack... so really, it depends on whether or not you value more dinosaurs in a game about making money off a dinosaur zoo. As for the dinosaurs themselves, they're all good in their own ways... Dryosaurus is a quintessential addition to any Morrison exhibit, especially since the previous Morrison roster (Brachiosaurus, Apatosaurus, Camarasaurus, Diplodocus and Stegosaurus) are massive behemoths, yet Dryosaurus is small and adorable. Nigersaurus gives Ouranosaurus a buddy, is very unique by sauropod standards (both in game and in reality) and is cute in a chubby baby hippo sort of way. Homalocephale is the smallest of the small (well, prior to the inclusion of Compys) and is just pure adorable itself... really, they're all pretty cute.