The best replacement for sor is sibor.

The best alternatives to sor are rated as following:
★★★★★  sibor
★★★★  soc
★★★  sov
★  sibor rates
★  gauss seidel
★  nor

Your alternative for sor is not listed? Suggest!
Speaking about sor, one probably shouldn't forget about gauss seidel.

Other search terms related to sor and their ratings are:
★★★★★ gauss seidel
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sor
sibor
soc