Vinyl railing is affordable, comes in a variety of styles, can offer privacy (depending on the design), and requires virtually no maintenance whatsoever. Beautiful and tough, it offers the best of both worlds.
Aluminum, unlike many other railing materials, isn't susceptible to corrosion or rust, and it can easily hold up to tough weather, including ice, snow, rain, and UV rays. Aluminum railings also won't splinter, twist, shrink, or warp. In nearly all environments, no matter what Mother Nature throws at them, aluminum railings should remain durable. The durability of aluminum contrasts sharply with the frailty of wood. If you don't maintain wood railings properly, they will fall apart as the years go by.