I recently added UBS4 to the top of my prioritization list, but using advanced prioritization limited its position there only to Bruce Metzger's textual commentary on the NT. My top ranked Bible for all other resources remains the NRSV. It seems the Android app doesn't respect advanced prioritization parameters, because now when I tap on a New Testament Bible reference in any resource it pull up the Greek text.
The iOS app seems to suffer from the same bug.