The NRSV and NRSVU are both updates of the Revised Standard Version. All of them are formal equivalents, and the NRSV comes from an ecumenical committee. This background is displayed in some of the translation choices. These considerations may cause hesitation to embrace this version as a primary translation.
Norman L. Geisler and William E Nix. From God to Us: How We Got Our Bible, Revised and Expanded Edition, Kindle Edition. (Chicago, Moody Publishers 2012). p. 359
Gordon D. Fee and Douglas Stuart. How to Read the Bible For All Its Worth: 4th Edition, Kindle Edition. (Grand Rapids: Zondervan, 2014). P. 56.
Biblegateway on NRSVU: https://www.biblegateway.com/versions/New-Revised-Standard-Version-Updated-Edition-NRSVue-Bible/
Translators: https://www.zondervan.com/p/nrsv-2/#committee