I am familiar with all of these schools and each one will give you a high quality legal education.
One thing to careful about with the scholarships at any of these schools though is the stipulations. I believe all of them require a 3.0 GPA to maintain your scholarship, which is very misleading to incoming law students. Law school is a lot different than undergrad and I believe at each of these schools only 35% of the class can have a 3.0 at the end of first year, which means there is a 65% chance you will lose your scholarship at Santa Clara or GGU. You can negotiate for better conditions, but you need to and should bring it up if you are attending a school based on the scholarship.
I have visited and been on all four of these campuses multiple times and I have strong feelings about each one some positive and some negative. My two cents USF has a beautiful campus and I like the neighborhood; Santa Clara is in San Jose South Bay, which is not an area I like and I feel there is a smugness from that school; Hastings is an ugly campus in the heart of the Tenderloin and my least favorite of all the schools; GGU is probably the ugliest of all the campuses; but it is in downtown San Francisco and probably has the most supportive student environment.
However, those are my opinions and what I as an anonymous internet poster thinks should have no bearing on your life altering $100,000 3 year commitment. With that I strongly encourage you to visit each school talk to professors; admins; students; alumni; walk around the campus; the neighborhoods; and after each visit your gut will give you a feeling.
Of these four schools there will be one you do not like I guarantee that as they all have different cultures, but listen to your own gut when visiting the school nobody knows what you will like best better than yourself.
As to the quality of education at any of these schools or any ABA school for that matter you will learn the same exact thing. Your first year will consist of Torts; Contracts; Civil Procedure; Property; and Criminal Law; and you will read Supreme Court Cases. At many of these schools you will have the same professors.
Peter Keane for example has and does teach Constitutional Law at Hastings; Golden Gate; and University of San Francisco. Hastings Bio for Keane; http://www.uchastings.edu/academics/faculty/facultybios/keane/index.php
GGU Bio for Keane http://law.ggu.edu/faculty/bio/peter-keane
Michael Zamperini has and does teach Torts at Hastings and Golden Gate. Hastings bio http://www.uchastings.edu/academics/faculty/facultybios/zamperini/index.php and GGU bio https://law.ggu.edu/faculty/bio/michael-r-zamperini
I could provide endless examples, but these schools are all interconnected and the education you receive will for all intents and purposes be identical. After three years you will then end up in cramed BarBri course with students from each school then take the California Bar Exam in an even more crowded Convention Center. If you pass the California Bar you are a lawyer regardless of the school you attended and any of these schools will provide you with a bar exam ticket and the legal knowledge to pass the exam.
One difference between the two schools is that Hastings and Golden Gate have very active mock trial teams while USF and SCU do not. Mock Trial competitions are one of the unique things that some schools offer and if litigation is something you are really interested in then Hastings or GGU might provide more opportunities than SCU or USF.