Seeds of Evil was my introduction to the series, but the original Dinosaur Hunter is by far my favorite. Movement and combat are more fast-paced than the sequels,  I feel the level design was generally better, and the soundtrack is badass and atmospheric. Plus most of it's themes and enemies, like the Bionosaurs, Campaigner and Longhunter, were pulled straight from Valiant's Dinosaur Hunter comics, which is my favorite incarnation of the character. It also had the most dinosaur variety out of the N64 games, succeeded only be Evolution and maybe Turok 2008.