The best replacement for oxford comma is vocative comma.

The best alternatives to oxford comma are rated as following:
★★★★★  vocative comma
★★★★★  serial comma
★★★  harvard comma
★★★  yale comma
★★  cambridge comma
★  no oxford comma

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Speaking about oxford comma, one probably shouldn't forget about ampersand.

Other search terms related to oxford comma and their ratings are:
★★★★★ ampersand
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oxford comma
vocative comma
serial comma