16 button controllers often give your left middle finger, left thumb, right thumb, and right index finger their own dedicated buttons.
Also known as the Deluxe16, the D16 is a leverless controller with 16 buttons that allow you to use it as a WASD controller too.
One of the ways in which the Haute42 R16 is different than its predecessors is the inclusion of a leftmost button for your pinky.
The TIKITAKA T16 is a stickless controller with 16 buttons, and its dual layout allows you to use it as a WASD controller as well.
Panda Fighting offers a variety of all-button controllers in different layouts and sizes, such as this controller that has 16 buttons.
The Haute42 M16 Plus is an elegant leverless controller with a metal body, large buttons, and dual layout.
The KBGM-H04 is a dual layout controller with an aluminum alloy top and acrylic bottom. You can also add an extender for your wrists.
Just when you thought the T16 could not get any better, Haute42 gave us the T16-C with fast Crystal switches.
The DuelPad A16 is an acrylic controller that has 16 buttons with LED support and even comes with a modern console port.