Here's UTRGV's announcement.

UTRGV Announcement.

WAC vs SLC by sport

Using the Warren Nolan site, here's a quick comparison of the two conferences.
Link to Warren Nolan site

Men's Basketball (NET)
..............................................2022*..................2023*...............2024
WAC.......................................15.......................11......................14
SLC........................................29.......................30......................27

Women's basketball (NET)
WAC.......................................24.......................16......................21
SLC........................................32.......................27......................25

Baseball (RPI)
WAC.......................................19.......................16......................20
SLC........................................18.......................14......................13

Softball (RPI)
WAC.......................................NA.......................15......................16
SLC........................................NA.......................12......................10

FCS Football (ELO) WAC football includes ASUN teams
WAC.......................................NA........................7.......................6
SLC........................................NA........................9......................10

* 2022 and 2023 Include Sam Houston and New Mexico St. (Football comparison includes the ASUN teams including Jacksonville State which is now a Conference USA member along with Sam Houston and New Mexico St.)

I haven't found conference comparisons for the other sports, but here are some links with rankings at the team level.
NCAA Statistics: NCAA Statistics

USTFCCCA Rankings (Look at SOUTH CENTRAL Region for SLC team and part of the WAC. The remainder of the WAC is in the WEST and MOUNTAIN regions)
USTFCCCA Rankings.

Thanks for the statistics.

We don't have softball, but we do have volleyball. No conference rankings but the four best RPIs are:

SLC 84, 157, 162, 212...
WAC 36, 76, 112, 135...