Six button controllers can be considered the bare minimum to play games that came out, say, around 2009 onwards, but you’d probably not have macros.
The R8-SF2's Happ joystick and buttons in a straight layout let you play games like SF2 like how they were played decades ago in the States.
The FightBox R8-J is like the PDP Mortal Kombat Klassic Fight Stick—but with Sanwa parts and a more modern enclosure.
BD Retro Mods makes awesome lever and leverless controllers that you can enjoy with retro or modern games.
Mortal Kombat players can buy the FightBox R8 with old school Happ parts—or the R8-J edition with Sanwa parts (and a more modern enclosure).
The R4's slanted layout has Sanwa buttons, and its Sanwa joystick can have a Sanwa bat or ball top. The R3 and R2 editions have less buttons.
The GRS Super Joystick is officially licensed by SNK, features Ikari Warriors artwork, and has a rotary joystick.
The BSP-Y01 ultra mini arcade stick was designed to dock phones, but it also has multiplatform compatibility.
This addon for the Legends Pinball machine by AtGames can also be used as a standalone PC arcade stick if desired.