Walk around any ten-year-old house in Placer County and you'll see the same thing: the north side looks fine, the south and west sides are faded, chalky, and starting to peel around the trim. Summer afternoons above 100 degrees cook paint, and UV breaks down the binder that holds it to the wall.
Paint doesn't peel because the paint was bad. It peels because it was applied over something that couldn't hold it: chalky old paint, bare wood that was never primed, or caulk that had already cracked. Every one of those is a prep problem, not a product problem.
The prep that works here is simple but slow. Wash the house to remove chalk and dirt. Scrape and sand any paint that's lifting until you reach a sound edge. Prime every spot of bare wood or patched stucco. Cut out and replace failed caulk at windows, doors, and trim joints. Then, and only then, apply two coats of a quality exterior paint rated for UV.
Timing matters too. Paint applied to a wall that's already hot in the afternoon sun dries too fast and doesn't bond properly. We follow the shade around the house so each wall is painted when the surface is cool enough for the paint to cure the way it's designed to.