When I went to visit the department everyone was very warm and inviting. I met with faculty, staff and students and everyone made me feel like they wanted me in the program. With the department being so small, there are great opportunities to really get to know the faculty for research and mentorship. With only 100 students in each cohort, its easier to get to know everyone and develop a support system through the grad process. I am not sure what you are looking for in a program but I keep highlighting support because when I was researching schools that was a really big deal to me.
I also like the internship placements but from what I hear they are very similar to USC and some of the Cal States. I have heard that UCLA's curriculum is going through some transitions. I do not know if this would be considered a negative or a positive but I think it is important to note.
Ultimately, the biggest sellers for me was cost and location. I could not find a reason to justify paying for USC. I also live on the westside and I wanted to stay in my apartment and not have to relocate my family.
In the end, both are great schools. So I think you will be okay with whichever one you choose.