Controllers that have LED support usually have lights that can shine around their buttons or through their sides as well.
We can rave on and on about the benefits of the MS1, but its selling point is its unique right thumb button placement.
It's mind boggling how a small controller like the open source SplitFox Pro packs a split layout with 18 buttons into its little frame!
The Starburst is a mini leverless controller with 15 buttons, and you can tilt it to more than one angle for the comfort of your wrists.
If you don't need 16 or more buttons: the VSLAB VSNOVA N14 is a fine option with chamfered acrylic, customizable art, and cool LED.
The TIKITAKA M3 doesn't have 16 buttons. It has 17, and the 17th button is a rare fully sized start button on the top panel's upper left.
The FRS Mini is a mini version of the bestselling FRS by Furin Arcade, and its 16 buttons mean that you have access to a dual layout.
The CounterHit Compact is the creation of a Seattle engineer, and its loop lets you attach the tiny CounterHit Nano controller.
Even though the MustFun Board looks like the Haute42 B16, it has some interesting differences, such as an onboard screen.