I interviewed at all 3 of these and can share my thoughts/impressions, although I'd love to hear residents' views as well (and I'm no authority)
From what I can tell, Olive View and Harbor are probably the best for clinical training. This is according to n = 4-5 UCLA med students, resident interactions/morning reports and my impression of the day. Olive View is a favorite for UCLA students due to "amazing" attendings (haha, I feel like a Zagat review) and is generally regarded as a place where you work hard but have autonomy, exercise your diagnostic skils (ie working up people who have never been seen before by a physician, really diverse range of diseases), receive great guidance and teaching, etc. Mostly Hispanic patients from what I hear. Also, it's smaller than the other 2 affiliates w/o all the consult services, so take that FWIW. Harbor would probably be second or tied for pathology, although here you work harder in terms of scut (from what I hear); i.e. you do draw blood cx and a resident mentioned you have to "follow up" a lot. I was very impressed by the residents/chiefs, they were REALLY nice and just fun to talk to. Negatives: Apparently there was a push to close the hospital down a while back; MLK (a USC county hospital) closed instead. This is scary to me - although I hear that it's going to be around for 'at least" another 4 years, what happens to the residents, training etc if it closes down?
Cedars is the nicest but also the cushiest, more than one resident mentioned they picked the place because they wanted a program that "took care" of them; all emphatically stated they were under the 80h work week. I'm sure you'd emerge here well trained as well. As someone pointed out you only see the uninsured pts (not the famous ones) as a resident. By far, this is the most glamorous/glitzy/beautiful hospital I've seen...
As far as rep, my feeling was that Harbor may have an edge here. But I'm not really sure. I think all are well regarded in Cali, as all are UCLA affiliates. None appear to be malignant by any stretch of the imagination.
Location: I think the poster above hit it pretty well. Olive View is in a secluded area but you can live far away and drive against traffic. Harbor is urban, near the Exxon refinery (ahh, smokestacks of urbanization). Cedars is in swanky town minutes away from stores like Kitson, Mikimoto, etc. etc. I don't know if that would just be too crazy for some people. After spending an afternoon walking around the area which was basically dripping in luxury and opulence (I saw paparazzi!!), I almost had to get away due to that sickly, bloated, post-holiday-party-food-and-drink-extravagance feeling. To each his/her own though.
Fellowships: Cedars has great cards, rep for not really favoring their own residents, not sure if this is really the case. Great for GI (spoke to a resident who picked this over UCSF for the potential to get into Cedars GI). You work with big, big names here so potential to get great letters. Harbor is also good for cards (apparently has a very cushy cards program.) Olive View, I'm not really sure. But you do get the chance to rotate at Cedars for up to 2 mos, so could always work with a big name cards fellow here I suppose.
I think that's it. It will definitely be a tough choice for me between these three.