Both are premium exterior paints. Sherwin-Williams calls Emerald its finest. Duration is the one built around a thicker coat. Here is how they line up on the Sherwin-Williams product pages.
Where Duration has the edge
Two lines on the Duration page stand out. First, flash rust resistance, which helps keep nail heads from bleeding rust through the finish. Second, tannin bleed resistance. Tannins are the brown stains that can push through paint on some woods. If you have wood siding or an older house with a lot of nails, those matter.
Duration is also the one Sherwin-Williams lists with 100 VinylSafe color options. That helps on vinyl siding.
Where Emerald has the edge
Emerald is the top of the line, and Sherwin-Williams stresses fewer coats and resistance to dirt pickup. If you want the best Sherwin-Williams makes, it is Emerald. If you want a self-cleaning version, that is Emerald Rain Refresh. Here is how those two differ.
A word on coat counts
Sherwin-Williams says Duration needs one coat on a repaint. That is a good-conditions claim. A big color change or a worn surface can need more. Whatever you pick, get the coat count in writing in your estimate.
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