The gloss offers a lot of light reflection, making the print very eye-catching. Trade show graphics are a different story, however. You would not want to use a glossy laminate because the overhead lights would give too much glare. Instead you should use a lustre laminate. It gives the image a rich sheen.
Colors appear very saturated and rich.
For posters that will be hung up and taken down often or promotional handouts, you would want to use a matte laminate. The matte laminate offers protection for the piece and it doesn't generally show fingerprints. As mentioned earlier, there are various types of laminates, both hot and cold. According to Crawford, the type of laminate you use depends upon your market. Before you pick your laminates, you need to determine you general market and get laminates to suit that market.