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Tengen has a lot of content and presentation than what Nintendo released. But to be fair, the Tengen version is also based off the arcade version, which is made by Atari. The Nintendo version, however, is as straight forward Tetris as you could get, but it's much more difficult than the Tengen version, which some people prefer.
EDIT: Forgot to add that the Tengen version has 2-player options.