The best law school for you will depend on many factors. Often the school that has the practice area you want to study in the geography where you live will be the best school. Law schools vary dramatically by price, and that is always important to consider. Because the ABA has such high standards, it is a fact that you can get an excellent legal education at every accredited law school. Certainly some law schools are more selective than others because they get more applications and have fewer seats.
Some people measure the quality of the school by how selective it is.
Other people measure the quality of the law school based on the success of its law school graduates. You should be asking questions of each law school about cost, financial aid, course offerings, and the success of its graduates. You will also want to assess how selective that law school is and whether or not your credentials are similar to the credentials of students who are admitted to that law school. Some is free and some costs money. The site also has links to every accredited law school, so that's an excellent starting place, and every law school now has a web site.