John Piper has often remarked that he finds the most help from old commentaries. It is the Puritans and other Christians from previous generations that usually made a point to wrestle deeply with the questions raised by the text and its theological import, rather than mainly the technical details. Nonetheless, it is important to be aware of the modern scholarly commentaries, and there is indeed much benefit that can be derived from them as well. In addition, a precious few do stand out as continuing the spirit of the former days. We would recommend the following as some of the more significant modern commentaries and resources on commentaries written from an evangelical perspective.
Many of these commentaries are available from Logos Bible Software.
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Ruth : ranked 1
Lamentations : ranked 2