First off, part of your decision should be based on which translation you prefer, the NABRE (Catholic Study Bible) or NRSV/RSV (NOAB). All three are approved translations and have their strengths and weaknesses.
Secondly, will you be purchasing a hardcover or leather edition? The Catholic Study Bible comes in bonded leather while the two NOAB’s come in genuine leather.
Thirdly, the Catholic Study Bible will be more geared for Catholics. It has a 500 reading guide before the Biblical texts itself, which gives many valuable historical, literary, and scholarly comments. I reviewed this bible a few months ago:
catholicbiblesblog.com/2014/03/review-catholic-study-bible-nabre.html