Exactly - there is no ONE top school. Top what? How do you measure it? The school may be successful - but will it make YOU a successful actor? It's different for different people.
Make a list of all the things you will look for in a theatre program. Also include things you look for in a college. Finally, things in a city.
Then, put each listing into a priority. Once you have a prioritized list, begin your search. Once you have some schools that seem to go along with your list, go visit them. See how they are up close. Audition for their theatre programs, even if you're not sure you want to go there. Stay overnight with a student. Attend some classes. Visit all theatre spaces.
Here are some general things to look for:
Theatre Program:
-Size (How many freshmen enter each year? How many in program now? How many acting students, compared to tech and directing/stage management?)
-Classes (How many acting classes? What special topics? What are the requirements to obtain your degree?)
-Spaces (How many different performance spaces are there? Rehearsal spaces? How technologically advanced are they? Do they get good sized audiences?)
-Shows (How many shows are done each year? Plays vs. musicals? One-acts?)
-Students (How friendly do the students seem? Would you fit in?)
The College:
-Classes (What classes not related to theatre do you need to take to obtain your degree? What is an average class size?)
-Size (How large is the campus? Would you need a car?)
-Facilities (What facilities are offered? How is the cafeteria food? How many places to eat are on campus?
-Cost (How much is tuition? What scholarships will I get? How much federal aid will I get? Grants? Loans?)
-Construction (Find out if there are plans for renevation. Will this affect any theatre buildings? Your schooling? Your housing?)
-Parking (Enough parking? Need a car?)
-Housing (How are the dorms? Big enough? What is offered in the dorms? What furniture is given? What will I need? How many roommates will I have? Internet? Heat? AC? Lighting? Policies?)
The City:
-What professional theatres are located nearby? What other colleges are close by?
-Are there recreational places close by? Theatres? Movie Theatres? Clubs?
-Closeness to shopping areas, such as malls, restaurants, banks, etc.
-How large is the city? How would I get to the city? Bus? Drive a car? Get a ride from a friend? Easy to get lost?
-How safe is the city?
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle