I agree with the the consensus that you shouldn’t try to pick a college based which one you think will get you into the best law school. But I’ve always understood that law schools weigh GPAs differently from different schools. This article is a quarter-century old, but it shows how Berkeley Law (then Boalt) weighed GPAs from various undergraduate institutions: Grading the Grades: All A's Are Not Created Equal
The interesting thing from that article is that Swarthmore and Williams were the two schools whose GPAs were given the most weight (i.e., they had the toughest grading) and they were nearly identical. In other words, you’re not likely to gain an advantage at either school.