ASU( CS major) vs UCIrvine (undeclared) : Which one to choose? Please help!

Hello
We live in Henderson, NV. My son likes to get into Computer Science. He has been accepted in ASU(CS-cyber security). UCI has accepted him as undeclared. He wants to go to UCI. We are worried that he might not get into computer science there. He has taken AP computer Science in high school. We, parents haven’t gone to school here and don’t realy know how to make the decision. Please help!