If there's no glitch or other gameplay (e.g. not including text/cutscene changes) difference that makes J faster than U, use U as per the site's guidelines.
There's no precedent for a TAS on tasvideos being accepted that uses TAS tools built into the game, rather than provided by a separate emulator (or Hourglass). For example, the answer to 'Can a Doom TAS using the in-game demo replay feature be submitted here' has always been 'no'.
I'd compare it to the sprite swap glitch of SMW, myself, where you can get the goal tape or a chuck on Yoshi's tongue because it is in the same slot Yoshi was trying to eat.
Bizhawk uses for its SNES core lsnes, which is extremely CPU intensive.
You can use snes9x 1.5x instead if your computer is too weak. Submissions on this emulator are accepted.
In that case, will you be timing out any of the stage 5 boss phases in hard, 2 player?
EDIT: And what is the criteria for getting the maximum amount of chains at the end of stage 3? You seem to take it rather leisurely.
There is a very large overlap between TASers and speedrunners. To me, it would be like saying someone who composes music in a DAW but can't play a song on an instrument live is not a musician. To me they still are, just a different kind.
It. does. not. matter.
If you ask 20 different people, you will get 20 different definitions of 100% for this game.
Furthermore, it's not even relevant until someone or some group actually starts making a run, in which case they're going to use their own personal definition anyway.
Literally nobody is going to convince anyone else that their 100% is the right one. NEXT TOPIC PLEASE (it would be nice if a mod could prevent pointless 100% discussion from taking up dozens of pages)
Won't vote since I haven't watched it, but isn't Bizhawk the emulator of choice now? Or lsnes? Which means this should be rejected for incorrect emulator usage.
Snes9x 1.5x is also accepted, even though it's not as accurate it's accurate enough to be a good alternative for people who don't have fast enough computers to run lsnes/etc
