Roller Coaster Tycoon 3 vs Zoo Tycoon 2?

i have both games rct3 and zoo tycoon 2 i all so have zoo tycoon 2 marine mania the expansion pack to zoo tycoon 2 that adds more animals and i have soaked expansion pack for rct3 that adds water rides so i need to know what should i play rct3 or zoo tycoon 2
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