Taylor (HLS 1932) tried to be fair, but in assessing how well each school instructed students "in the regular tools of the lawyers trade—legal technique, in other words," he gave what I think of as the standard HLS line on YLS:
I’m pretty well convinced that the honors lie with Harvard. Most of the well-known men at Yale are men who are themselves bored with the law & have turned experimentalist. They’re brilliant enough, & their writings are worth reading, but they are too interested in explaining to you how the law is a very different thing from what most people think, & how there really isn’t any such thing as law anyhow. Now this is all very well & worth knowing, but you don’t practice law by telling a client or a judge that his traditional concepts are all screwy. Defective as the tools of the law may be, you’ve got to be familiar with them & know how to use them. I think the system & faculty at Harvard does this much better.Waldron, not all that surprisingly, chose Harvard.
(For more of the same, see Spencer Tracy's wisecrack to Katherine Hepburn in "Adams Rib" (1949)--"Is that what they taught you at Yale?"--and Laura Kalman's Legal Realism at Yale. Thanks to David Warrington for the heads up and transcription!)
Image credit: Prints and Photographs Division, Library of Congress