[ Triple-washing in wuḍūʾ]

Answer: What is preferable for the legally responsible person, when Sunnah acts come into conflict, is to preserve the more important of them. The congregational prayer is more important than triple-washing; for triple-washing in wuḍūʾ is Sunnah by agreement of the scholars, whereas as for the congregational prayer, among the scholars of the Ummah are those who say it is Sunnah, those who say it is a communal obligation (farḍ kifāyah), and those who say it is an individual obligation (farḍ ʿayn)—and each of the three views rests upon evidence that indicates it.
Likewise with respect to any conflicting religious obligations that face the legally responsible person: he gives precedence to the more important over what is lower in importance. Thus, an individual obligation takes precedence over a communal obligation; a definitive obligation takes precedence over a presumptive obligation; an obligation agreed upon as obligatory takes precedence over an obligation disputed in its obligatoriness—and so on. Obedience to the mother takes precedence over obedience to the father in cases of distressing conflict; obedience to Allah takes precedence over obedience to one’s parents; fulfilling the need of a near kinsman takes precedence over the need of a stranger; likewise, reconciliation between disputants takes precedence over judging between them. Averting harms takes precedence over procuring benefits; the superior act takes precedence over the less-excellent; and some evils are lighter than others—so repelling the greater evil is prioritized over the lesser.
Source : Min Thimār al-ʿIlm wa al-Ḥikmah vol.1