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DFF and DSF both store the same DSD audio data — the difference is the container. DFF (DSDIFF) was the original container, designed by Philips for SACD authoring. DSF came later, designed by Sony, with the notable advantage of supporting ID3v2 metadata tags. Since music listeners generally want album art and track info, DSF has become the more popular format for consumer distribution.
You'll encounter DFF files in SACD rips, particularly older ones made before DSF became the preferred container. The audio quality is identical to DSF — both carry raw DSD bitstreams. The practical difference is metadata: DFF files typically lack album art and detailed tags, while DSF supports them natively.
The same players handle both formats: foobar2000 with the SACD plugin, Audirvana, Roon, and JRiver. Converting between DFF and DSF is lossless (just repackaging the same DSD data) and can be done with tools like dBpoweramp or foobar2000.