Wood fiber is a wood-composite product, such as MDF or molding. When used in siding, it is made from wood fibers, glue, and other fillers. The product is then molded into clapboard and then textured like real wood, with options to be painted as well. A very cheap and easy to install option, wood fiber is available in a range of colors and makes for a good siding option for homeowners.
Fiber cement is similar to wood clapboard; it cuts, nails and installs just the same way. Made up mostly of cement, this type of siding is fire and insect-proof, strong, and will not twist, warp or rot. Fiber cement also reflects and diffuses heat, meaning that in the hotter months, your home will be cooler, and in the colder months, your home will be warmer.