I think DFS has a different goal than the businesscard iso, which is ment to serve for further installation of software.
DFS is said to be:
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1) a bootable CD for repairing Linux systems or installing Debian; and 2) the program that generates the CDs that are used for #1.
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while the businesscard iso should be:
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This image contains just the bare necessities to start a Debian installation, i.e. those parts of the installer which are necessary to configure networking and download the rest of the installation system.
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See here what can you expect from DFS:
http://people.debian.org/~jgoerzen/dfs/html/intro.html
I'd say go with the businesscard if you'll use the installation for "usual" activities.