Question: Which is a public research facility, University of Texas System or University of California, Los Angeles ?
Context: The University of Texas at El Paso (UTEP) is a public research university in El Paso, Texas, United States.  The school was founded in 1914 as the State School of Mines and Metallurgy, and a practice mineshaft survives on the mountainous desert campus.  Following a reorganization of the University of Texas in 1920, the school was renamed the College of Mines and Metallurgy of the University of Texas.  It became Texas Western College of the University of Texas in 1949, and The University of Texas at El Paso in 1967.  UTEP is part of the University of Texas System. The University of Texas Rio Grande Valley (UTRGV) is a public research university in the University of Texas System.  UTRGV has multiple campuses in the Rio Grande Valley region of Texas; founded in 2013, it entered into full operation in 2015 after the consolidation of the University of Texas at Brownsville/Texas Southmost College, the University of Texas–Pan American and the UT Regional Academic Health Center - Harlingen.  The university has a new medical school. The University of Texas System (UT System) encompasses 14 educational institutions in the U.S. state of Texas, of which eight are academic universities and six are health institutions.  The UT System is headquartered in Austin, and has a total enrollment of over 216,000 students (largest university system in Texas) and employs more than 87,000 faculty and staff.  The UT System's $24 billion endowment (as of the 2016 fiscal year) is the largest of any public university system in the United States. The University of North Texas (UNT) is a public research university based in Denton with programs in natural, formal, and social sciences, engineering, liberal arts, fine arts, performing arts, humanities, public policy, graduate professional education, and post-doc research.  Ten colleges, two schools, an early admissions math and science academy for exceptional high-school-age students from across the state, and a library system comprise the university core.  Its research is driven by about 34 doctoral degree programs.  During the 2013–2014 school year, the university had a budget of $865 million, of which $40 million was allocated for research.  North Texas was founded as a nonsectarian, coeducational, private teachers college in 1890; and, as a collaborative development in response to enrollment growth and public demand, its trustees ceded control to the state in 1899.  In 1901, North Texas was formally adopted by the state.  UNT is the main campus of the University of North Texas System, which includes additional campuses in Dallas, Fort Worth, and Frisco. The University of Texas of the Permian Basin (UTPB) and the Los Alamos National Laboratory (LANL), are proposing a multifaceted energy research facility called the High-Temperature Teaching & Test Reactor (HTR or HT3R) to be located in Andrews County, Texas.  The proposal envisions a 25MWt (Megawatt thermal) reactor operated by a merchant nuclear power operating company with the education and science at the facility managed through an arrangement between LANL and UTPB/UTS (University of Texas System). The University of Texas at Dallas (UTD or UT Dallas) is a public research university in the University of Texas System.  The main campus is in the Richardson, Texas, Telecom Corridor, 18 mi north of downtown Dallas.  The institution, established in 1961 as the Graduate Research Center of the Southwest and later renamed the Southwest Center for Advanced Studies (SCAS), began as a research arm of Texas Instruments.  In 1969, the founders bequeathed SCAS to the state of Texas officially creating The University of Texas at Dallas. The University of California, Los Angeles (UCLA) is a public research university in the Westwood district of Los Angeles, California, United States.  It became the Southern Branch of the University of California in 1919, making it the second-oldest undergraduate campus of the ten-campus University of California system.  It offers 337 undergraduate and graduate degree programs in a wide range of disciplines.  UCLA enrolls about 31,000 undergraduate and 13,000 graduate students, and had 119,000 applicants for Fall 2016, including transfer applicants, the most applicants for any American university. The University of Texas at Arlington (UTA or UT Arlington) is a public research university located in Arlington, Texas.  The campus is in the Dallas–Fort Worth–Arlington metropolitan area, and is adjacent to downtown Arlington.  The university was founded in 1895 and was in the Texas A&M University System for several decades until joining The University of Texas System in 1965. The University of Texas at Arlington Aerodynamics Research Center (ARC) is a facility located in the southeast portion of the campus operated under the Department of Mechanical and Aerospace Engineering.  It was established in 1986 as part of an expansion of UTA's College of Engineering.  The ARC contributes to the vision of UTA and the University of Texas System to transform the university into a full-fledged research institution.  It showcases the aerodynamics research activities at UTA and, in its history, has established itself as a unique facility at a university level.  The wind tunnels and equipment in the facility were mainly built by scouting for and upgrading decommissioned equipment from the government and industry.  Currently, Masters and Ph.D. students perform research in the fields of high-speed gas dynamics, propulsion (including Pulse detonation engines), and Computational fluid dynamics among other projects related to aerodynamics. The University of Texas at Austin (UT, UT Austin, or Texas) is a public research university and the flagship institution of the University of Texas System.  Founded in 1881 as "The University of Texas," its campus is located in Austin, Texas, approximately 1 mile (1.6 km) from the Texas State Capitol.  UT Austin was inducted into the Association of American Universities in 1929, becoming only the third university in the American South to be elected.  The institution has the nation's eighth-largest single-campus enrollment, with over 50,000 undergraduate and graduate students and over 24,000 faculty and staff.
Answer: University of California, Los Angeles