I think it all depends on class size. If the law school is small, they need to have a good idea about how is actually attending so Early Decision will probably help (Notre Dame said it does). On the other hand, if they have a large law school, they are probably number hungry and will probably WL if you are a marginal applicant, since they don't have a good idea about the entire class quality.
Thanks and Gig 'Em,
Jason