The Data Frog Y5A's unique offerings range from an optional wireless connection to 27 mm buttons that are hard to find elsewhere.
The RC-OF1 is a variant of the OFOF1 chassis design by Rana Labs, so it features charm holes in all four corners.
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 Split is divided into two halves connected through a coiled detachable cable—and should be compatible with future modules by Ultra Arcade.
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 SticklessBox features a rare combination of Sanwa buttons and the GP2040-CE firmware—plus a convenient carrying handle.
RetroGameBoyz makes retro game controllers, including arcade sticks, which can also be used for modern fighting games.
The CounterHit Compact is the creation of a Seattle engineer, and its loop lets you attach the tiny CounterHit Nano controller.