A top twenty list seems impossible. So I'll break it down like a good theater nerd. I'm not judging only on the music and story, but it's influenced by great productions I've seen or cast albums I've enjoyed. I actually like all of these - I left off many that are still good, but not enough for my list.

Orchestra:
Hamilton
Les Miserables
Ragtime
Dear Evan Hansen
Phantom


Mezzanine:
Wicked
The Music Man
Hello, Dolly
West Side Story
In the Heights
Little Shop of Horrors
Lion King
The Last 5 Years
Annie
Fiddler on the Roof

Balcony:
Spamalot
The Sound of Music
The Producers
Gypsy
Thoroughly Modern Millie
Urinetown
Once on this Island
Sweeney Todd
Into the Woods
Hairspray
Man of La Mancha
Aida
Beauty and the Beast
Parade
Guys and Dolls
Miss Saigon

Partially Blocked View:
Titanic: The Musical
Oklahoma
A Gentleman's Guide to Love and Murder
Seussical
The Scarlet Pimpernell
Joseph