Golden is the most complete version, but it does suffer a bit because of the new bits depending on who you ask. They added a lot of new events and cutscenes but IMO some of them are pretty bad, and the game balance was thrown out of the window too, with so many new things to help you that it's actually hard not to end up overpowered... It also added arguably the worst character in the main series as a new focal point for the story and the new epilogue, while not bad, it's largely unnecessary and kinda ruins the original ending.
QoL additions and costumes are great though.
I say if you have the means to play the original and don't own a Vita, don't get one just for this game. For people who own one tho, it's still definitely a great version.