Of the Trifoliate hybrids Carrizo Citrange is rated as good (G) for freezes, produces a large tree; Kuharske Citrange, rated G for freezes, produces a large tree; Benton Citrange rated G for freezes, produces a large tree; C-32 Citrange rated G for freezes, produces a large tree; C-35 Citrange rated questionable for freezes, produces intermediate sized tree; Rusk Citrange rated poor to intermediate to freezes, produces a small tree; Trifoliate Orange rated intermediate to Good for freezes, produces a small tree; Sour Orange rated good for freezes, produces a intermediate to large tree.
Sour Orange is rated good for salinity, high pH soils, clay soil, extra good for wet soils, intermediate for drought, good for freezes, high to high+ for juice. It biggest weakness is that it is very susceptible to the Tristeza virus. However, if your area does not have tristeza it is a great rootstock.
Millet