Plastic degrades and becomes brittle and weak when exposed to heat and UV rays. Also this particular design features a difficult-to-install set screw and clamp that is easy to lose. (note it is missing in the second bracket.) The bracket is bulky creating a light gap along the top of the rail.
EcoSmart Bracket features Stainless Steel for long life durability. It does not deteriorate with sun and UV exposure. The blind simply snaps into place for easy removal and re-installation — no parts to lose. Its low profile minimizes any light gap along the top of the headrail.