Compare
حفص vs شعبه
Both Hafs and Shu'bah are narrations from Asim ibn Abi an-Najud. Hafs is the prevailing recitation today; Shu'bah, the other student of Asim, is preserved in qira'at scholarship.
Notable differences
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general
Hafs and Shu'bah share the same Kufi counting system, but Shu'bah differs in specific words and in elongations. The list is compact — around five hundred points of difference — but each is carefully preserved.
Regional distribution
Hafs: global standard; Shu'bah: chiefly studied in qira'at programs.