A degree-of-freedom count applied to a new atlas of grand-unified gauge theories ranks SU(5) Georgi-Glashow first and SO(10) second for three generations.
Note also that the only model in the list that cannot contain the SM gauge symmetry is based on SU(4)
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Grand-unification Theory Atlas: Standard Model and Beyond
A degree-of-freedom count applied to a new atlas of grand-unified gauge theories ranks SU(5) Georgi-Glashow first and SO(10) second for three generations.