Most common Maples are the Sugar and the Silver. Both have roughly the same style leaf, 5 pointy lobes. Of the two, the sugar maple lobes are more compact and the silvers are more elongated. The Sugar Maple is considered a hardwood and is great for smoking, but the silver is a great smoke wood as well. The sugar maple being a harder wood, will give you a little more btu's, (heat for the amount of wood used) vs, the silver.
Many a great bbq joints swear by the use of sugar maple on their smokes.