* Size and Styling: The Eldorado was longer, lower, and wider than the Coupe DeVille. Its styling was even more flamboyant and dramatic, with more prominent tailfins and unique details like its signature "Dagmar" bumpers (large, heavily chromed bumpers). The DeVille, while still large and stylish, had a more conservative and refined look.
* Price: The Eldorado was significantly more expensive than the Coupe DeVille, reflecting its more exclusive status and features.
* Performance (Minor Differences): While both generally used the same powerful V8 engines (though there were subtle variations over the year's production), there might have been slight differences in horsepower or optional performance features offered. The differences were not dramatic.
* Interior and Trim: The Eldorado boasted a more lavish interior, often with higher-quality materials and unique appointments not found in the DeVille. This included more luxurious seating, trim, and optional features.
* Exclusivity: The Eldorado was the flagship model, positioned as Cadillac's top-of-the-line car. It had a smaller production run and was intended for a more discerning and wealthier clientele. The DeVille, while still luxurious, was a more attainable (though still expensive) model.
In short, think of it like this: the 1959 Cadillac Coupe DeVille was a supremely luxurious car, but the Eldorado was the ultimate expression of Cadillac luxury and extravagance for that year. It was the pinnacle of the line.
