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حفص vs دوری
Ad-Douri (from Abu Amr al-Basri) is the standard recitation in Sudan, much of Yemen, and parts of Somalia. Hafs is the global default. Ad-Douri preserves the Basri counting system with 6,205 verses.
Notable differences
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general
Ad-Douri applies imala (inclination) of long 'a' toward 'e' in many contexts — a feature absent from Hafs.
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idgham
Ad-Douri applies idgham (assimilation) of certain consonants where Hafs does not.
Regional distribution
Hafs: global standard; Ad-Douri: Sudan, most of Yemen, parts of Somalia, Eritrea, and Chad.