The Akecon Leaf can be bought as a lever or leverless controller with Sanwa OBSC buttons and the latest Brook PCB.
The LBER 2040-L16 looks and plays like an Haute42 controller but may have just the right amount of nuance for you to prefer its style.
Despite its small size, the Kylinix L14 manages to fit in 14 buttons, three USB ports, and more goodies that may appeal to you.
The Kylinix K15 is a spacious yet light & slim controller with more buttons than usual, and the buttons can even glow.
The FightBox F6-Analog-Stick has ALPS analog sticks, Sanwa buttons, and Cherry MX switches—making it suitable for a variety of game genres.
Just when you thought 16 buttons are a lot for a leverless controller, GuileKeys released the GK-21, which has 21 buttons!
As a spinoff from its legendary Panzer series, The Frame by Jasen's Customs is an aluminum-acrylic hybrid with a customizable layout.
FlatboxLab's bigger Flatboxes can feature sick art that can also show through the buttons, which have hot swappable switches.