Honestly, I think, “both,” really was the only choice. No one had developed for a joystick-exclusive console since the Atari days. Most third-party developers would have had a tough time porting and adapting their games over to an exclusively joystick layout. The other consoles of that generation, the Saturn and Playstation, both had D-pad only controllers and D-pad/joystick combination controllers; no one went joystick only. The N64 design was imperfect, but it allowed them to launch Mario 64 and Mortal Kombat Trilogy in the same year (and it was a step up from Sega’s crack at it).
Honestly, I think, “both,” really was the only choice. No one had developed for a joystick-exclusive console since the Atari days. Most third-party developers would have had a tough time porting and adapting their games over to an exclusively joystick layout. The other consoles of that generation, the Saturn and Playstation, both had D-pad only controllers and D-pad/joystick combination controllers; no one went joystick only. The N64 design was imperfect, but it allowed them to launch Mario 64 and Mortal Kombat Trilogy in the same year (and it was a step up from Sega’s crack at it).