どちらもOKと思いますが、下記サイト使うと傾向としては
husband and wife \u0026gt;〈(a) married couple〉\u0026gt;\u0026gt;wife and husband
のようです。
google.com/ngrams/graph?content=married+couple%2Chusband+and+wife%2Cwife+and+husband\u0026amp;year_start=2000\u0026amp;year_end=2019\u0026amp;corpus=en-2019\u0026amp;smoothing=3">https://books.google.com/ngrams/graph?content=married+couple%2Chusband+and+wife%2Cwife+and+husband\u0026amp;year_start=2000\u0026amp;year_end=2019\u0026amp;corpus=en-2019\u0026amp;smoothing=3
