North America had all the cool dinosaurs, the classics we all know and love: T-Rex, triceratops, stegosaurus, ankylosaurus, etc.

South America: the admittedly cool argentinosaurus but also a bunch of boring dinosaurs.

Chinese dinosaurs: basically just a bunch of feathered proto-birds, boring

European dinosaurs: the admittedly cool plesiosaurs but not much else of interest.

African dinosaurs: way too many copy and paste sauropods.

North America also has tons of synapsids from the Permian and pseudosuchia from the Triassic, to mention nothing of the Cenozoic mammals.