The more prestigious LA firms' cutoffs are top half at Columbia and top third at UCLA. Being in those ranges doesn't guarantee a job, and people below that can get those jobs still, but you're talking about roughly, ROUGHLY a 15% higher chance at LA biglaw from Columbia.
Not sure where you get 15% from. If OP is hoping to get one of the jobs that you describe grade cutoffs for the difference is roughly a 50% increase going to Columbia instead of UCLA (not factoring in a change in class rank moving from UCLA to CLS).
Yeah, massive statistics fail. Thanks for saving me the time of pointing that out.
Also OP, if CLS beats the pants off of UCLA that badly even in LA, you can imagine the huge difference between the two degrees in the security they'll provide you everywhere else.
Nice to see that the polling has finally taken a swing toward sanity.