If you consider other posts that are up for renaming, and which ones aren't, I'd vote for Benevidez.
Audie Murphy would rank higher on my list of people to name a post after. Murphy was in the 3rd ID. Fort Stewart, home of 3ID (most of it, anyway) is named after a Revolutionary War general, so I don't think that one is up for changing (right now). Fort Benning, home of the Maneuver school (the combination of the Infantry and Armor schools) and 3rd Bde, 3ID, is named after a CSA general. Given the presence of the school house, and part of the 3ID, I think Murphy's name would be a better fit there.
Thus making Benevidez probably the top candidate.
This being TexAgs, I should name some other potential candidates:
Sergeant George D. Keathley '37Lieutenant Eli L. Whiteley '41Lieutenant Turney W. Leonard '42Sergeant William G. Harrell '43Lieutenant Thomas W. Fowler '43Specialist-5 Clarence Sasser, '73
Leonard led a tank destroyer unit, and so might be the top of that list.
I left Carswell and Hughes off the list because they're Air Corps/Air Force, and thus their names belong on Air Force bases (Carswell's already is.)