New answers tagged priorities
At least with regards to hilchos Shabbos, you should choose the derabannan. See שמירת שבת כהלכתה לב:כז-כח*, who writes that if there is no difference in speed or quality of care, that one should choose to do a rabbinically prohibited action, instead of one that is Biblically prohibited. I don't know if this is Shabbos-specific, or if this rule applies ...
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