etoi marks the alternative between slavery to sin and obedience in Romans 6:16.

As a conjunction in Romans 6:16, ἤτοι introduces the alternative between sin leading to death and obedience leading to righteousness.

1. Marking an alternative between two outcomes · dominant

   In Romans 6:16, the conjunction stands within the contrast between being slaves of sin resulting in death and being slaves of obedience resulting in righteousness; the APB renders the clause "whether of sin resulting in death or of obedience resulting in righteousness."

   Romans 6:16

In the Anselm Project Bible: In Romans 6:16, the APB presents the alternative with "whether... or,".