A mini arcade controller is often so small that there is little to no wrist resting space, but the tradeoff is that you get something portable and so on.
The Granola Summit is an open source PLA Pro controller that has a port for additional console compatibility.
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.
The button layout of the Meisterbox M from Bavaria is supposed to make it the most ergonomic fighting game controller.
The Haute42 B16 is a larger version of the Haute Board Mini, and this time, it also has more keys, giving it a dual layout.
The Mini•Dub is a smaller version of the 4TW by jonyfraze, and the primary difference is how the edges are mostly straight.
Chibico by Acrycade Gear is a mini stickless controller that should be able to fit into a back pocket of a pair of pants.
The Hori Fighting Stick Mini is an average mini fightstick that might catch your eye in the sea of competitors.
The QRD Maestro S3 can either work wirelessly or with a wired connection, depending on your preference when you play.