If by original you mean the 2.5-hour theatrical version, the 3.5-hour Director's Cut is far better, for the extra footage as well as the improvements McBee mentioned.
If, however, you mean the 5-hour 'Original, Uncut' version (AKA 'Miniseries'), then get that one. The extra hour-and-a-half gives so much more character development that changes everything about certain of the crew. I prefer that version so much I gave my DC copy away.
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“Never do anything you can't take back.”
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