To give you an idea of the difference in pace between UCLA and CS, when I was an intern, both the UCLA and CS interns would go to the West LA VA. During my ICU month at the VA (which occurred after UCLA ICU that year), I was functioning on autopilot. We actually thought it was funny that they called it an ICU since there were only two (2) intubated patients, and literally 1 code during the entire month. People seemed bewildered by thing as simple as ARDs protocol ventilation or appropriate patient selection for Xigris. The Cedars-Sinai interns (many of whom are my friends, so I'm not talking down) were "overwhelmed" by the VA wards. This may have shifted as CS and VA are now combined, but the intensity of training between UCLA and CS is a magnitude of difference and it is not their fault. My friends acknowledge this - that is why they went to Cedars.
There is no mistaking that Cedars-Sinai is a private hospital in every sense of the word. Sure, many of the attendings there are "clinical professors" at UCLA, but we never see them, and the programs are completely separate for all practical purposes. Also, Cedars has a teaching service (i.e. MediCal service), but the majority of the floor patients are rounded on and managed by private attendings.
Traditionally, the Cedars cardiology fellowship never took CS residents, and always took 1-2 a year from UCLA. Now CS has merged with the West LA VA, and is "encouraged" to take residents from those programs. The fellowship is further diluted by now spending half your time at the VA (with VA attendings) and half at Cedars.
The bottom line is that if you are looking for a relaxing, educational 3 years with average/above-average fellowship prospects or the possibility of joining a lucrative LA medicine practice after graduation, go to Cedars. If you want a rigorous academic experience in a tertiary care hospital with lots of sick patients, transplant medicine, and renowned academic attendings (as well as the fellowship opportunities that go with it), come to UCLA. You will work *alot* harder at UCLA, but we still have more than enough time for fun - this is Los Angeles, after all