If you come across a 17 button controller, odds are that 16 buttons are for directional and attack inputs, whereas the 17th button is a function button.
The Haute42 W-P1 is a sloped controller with an optional wireless connection, and it is available in white as well.
The 8BitDo Arcade Controller Pro adds a left pinky button and brings the right thumb button closer to the jump button.
The Mojhon Fight Master—which has buttons that vary in their levels of concavity, convexity, and flatness—has an optional wireless connection.
Akko transitions from keyboards into leverless controllers—with the Funbox's 17 buttons and adjustable Hall effect switches.
You can enjoy the Varmilo JZA1's outrageous 19-button layout with a wired or wireless connection, and it's available in other artworks too.
The wireless IINE HB1 has a rare left ring-finger button, but you can cover it (and any other button) if you want.
The Haute42 Emotion III-17 has four thumb buttons, a couple of which are pill-shaped, and it has a left pinky button (plus a lanyard loop).
The FightBox B-Pro is the head honcho of the B series, given that it's got 17 buttons—a good number to conquer tournaments.