There is much information @ Deerfield on similar threads so I won’t fully repeat… The OP asked for some comparisons of these 3 different schools;
You can go to the website for Fast Facts & School Profile, Matriculation Data, Courses. Oh… yes…and Alumni Heritage award winners.
Deerfield -
Mid-Size school of @ 650
Countryside setting in historic town
Motto: Be Worthy Of Your Heritage
Best book & movie about school: Death Be Not Proud. You can see the campus in the movie.
From a parent perspective; The school is proud of its traditions and is probably the one of the most conservative of the NE schools… Generally, conforming to dress code of blazers/jackets in Fall & Spring.