Love both games, I would love ZT1 so much better if it didn't lag.
Zoo Tycoon 1:
Best:
-Has rarer species
-Has animal identification signs
-You feel more of a spark when you breed a giant panda, a tough thing to do in the game
-Have actual brachiating objects for orangutans.
-Can make guests throw up!!! (Zeta Psi)

-The zoo maps are ginormous
-Exhibits can hold more species at a time
-Better interactive things for guests such as: Mini golf, animal theater, Japanese garden, duck pond, snake pit, dolphin rides, jet skis, and more.
-Actually have animal houses that come with different attractions in each one such as (including all the packs): Shark Tunnel, Aviary, Reptile House, Primate House, Nocturnal House, Pterodactyl Cage, Extinct Amphibian House, Extinct Crustacean House, Aquarium, maybe more.
-Asian elephants require their natural habitat, tropical rainforest.
Bad:
-Can't go into guest mode
-Depending on the computer, if you make a large zoo the game with lag every other second.
-Komodo dragons are purple
-Graphics-self explanatory even maybe if you haven't played it
-There is no gestation period
-Only 5 animals are considered endangered when some of them really aren't
-Gorillas look like aliens
-Can't see your own map
-Every enclosed area surrounded by a fence is considered an exhibit
-Mountain animals are impossible to satisfy
Zoo Tycoon 2
Good:
-Has a gestation period
-Family trees
-Many of the animals can tolerate grass terrain, something that all zoos usually do
-Graphics and animations are more accurate
-The lifespans are accurate in terms of ratio
-Has bridges, safari rides, and sky rides
-Not every enclosed fence has to be considered an exhibit
-Like in real life, another giraffe can breed with the reticulated giraffe
-Mixing species is much easier
-Can take photos from the game and save them on the computer
-Has a Touch Pool for sea cucumbers, sea stars, and horshoecrabs
Bad:
-More endangered species but not as rare
-Gibbons and orangutans can't die!!-This is why I'm not using them anymore
-Lazy animal houses: Octopus, Reptile House (Chameleon, Slider, King Cobra), Insect House (Tarantula, Hercules Beetle, Hairy Scorpion), Seahorses, Octopus, Tropical Fish (Damsel, Clownfish, Tangs), Jellyfish, and more.
-No animal identification signs
-Maps, even the largest ones, are very small, and if I want to continue a family of a species, I usually could only fit around 14 exhibits in.
-For brachiating objects, you have to use outdated looking monkey bars.
-Requires fountains, plants, and statues all over the zoo
-0 interactive things for guests expect for playgrounds
-Has very little challenge to the game
-Guests need food and a bathroom at every exhibit
-Their Zoopedia says that the largest cat is the Bengal tiger