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What is the difference between the DCS and DSA key caps exactly?
DSA has keys that have spherical depressions in them, think 1970s computer terminals; DSA keys don't have as deep of a depression compared to very old keysets however. DSA is also a fairly low profile, and each row is the same height and flat angle.
DCS is a sculpted cylindrical profile, where each row is angled slightly differently and has a different height. Most rows are somewhat taller than DSA. DCS is closer to what you'll find on most keyboards as both Cherry and OEM profiles are common and all three are sculpted.
You can see a comparison here: http://www.keycapsdirect.com/key-caps.php
The main difference is that DCS is sculpted, and DSA is not. Sculpted means that each row has a different height and slope.
This might be an issue with printed legends, because you can't swap keys any way you want to match the configured layout. However, since these are blank keycaps, it comes down to preference.