One of the biggest reasons for buying Giclee Prints over original artwork is the price of the print. Giclee Prints are far less expensive than Original Artwork.
Art can be broken into two categories, collector art and decor art. If you are decorating your home or office with art that you purchase with the idea that it will increase in value over the years, then by all means purchase the original art.
Giclee art on the other hand, when printed by an expert printmaker, will match the original so closely that it will take an expert to tell the difference. And since Giclee prints are made using archival inks and paper it will last for more than a hundred years. However, the prints must be displayed away from direct sunlight so it won't be damaged.