Sort of late to the party, but LINE-X with LINE-X Xtra (prevents fading) is much more durable than powdercoating.
Steps will either be made of mild steel (can rust) or stainless steel (much more rust resistant). Stainless steps will typically have a lifetime warranty and mild steel steps will have a 3 year warranty. Obviously, SS will cost more.
NFabs with black LINE-X Xtra.
A powdercoated grill guard with rock chips.