I trust UCLA's cohesiveness and integrity on defense a lot more than Arkansas. UCLA also had a seven game winning streak this year beating Wisconsin, Michigan St and Oregon.
Arkansas has never strung together five good games this year. They lost to South Carolina by 20!!! two weeks ago, while playing for their tournament lives. They're also extremely banged up. Theiro is their best player and would be an interesting matchup for RJ or Kadary, but he may not play. Boogie doesn't scare me coming off of a finger injury. They have a seven man bench as is. We'll wear them down.
Kansas is sort of scary but they also can't shoot 3s. They are a poor man's version of, us. After their 34 point embarrassing loss to BYU, they've only gone 4-5. The two things that would scare me about an opponent is three point shooting and an elite dribble penetrator, and I don't think they have either.