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I have had the opportunity to work with a few professors from the law school at my school in 1 credit hour classes with >5 people. Although I have had most of these professors for only one 1 credit hour class, the small class sizes have allowed me to get to know them fairly well - but I am concerned that it will look like I am just trying to find law professors that I hardly know to write me LORs.

Any opinions here? Is it better to get a LOR from an instructor that has led a couple large classes I have taken, even if I feel they know me less well than the Professor I had for a single 1 credit hour class?

Also, secrets to choosing the right recs among the handful of profs I have strong relationships with?

They all come from different schools I could only dream of, so I will probably have each write one specifically for their alma matter. But beyond that/more generally, what profs do you choose?

Professors who know you better are always better than professors who seem to have more impressive credentials or taught a more "important" class.

And you're grossly overestimating the importance of a letter from an alumnus. It's a better idea to get to know one or two professors really well and get get good general LORs from them than it is to get 5 specific LORs from professors who kind of know who you are.

Yeah I'd just get 2-3 generalized strong letters.
There is absolutely no reason to get five letters.