I say Padmé, just because she was so much younger, and if she had survived she could have raised the kids. But Han Solo’s is very close because he was killed by his own son, who deeply regretted killing his father.

Han Solo, arguably one of the best characters, was killed by his own son. That scene is where the OG star wars fans cried. His death was way sadder

Padme Amidala because of the symbolism of the scene. Padme's last breath occurred at the same time as Darth Vader's first breath...or at least in his fancy new black armored suit.

Han Solo's death was sad, and a shock at the time. However, after watching the Sequel Trilogy as a whole, it did feel like Solo's death was just something they decided to do for shock value, or at least Harrison Ford's wishes, rather than a compelling storyline. It did enhance Kylo Ben's character development, which is one of the few redeeming qualities of the Trilogy, but otherwise it was mostly tongue-in-cheek. Especially when, in the years of anticipation for the Sequel Trilogy, no one thought about having the OG cast reunite in the same room somehow. Granted, flashbacks and prologue scenes weren't a thing at that time, but still.

Padme’s death is heartbreaking but so is Han Solo’s. This is hard

To me Han’s death was more sad

Why Han because it was more impactful, people grew up upon. yes, same thing of Padme. The thing with Padme is is a little too over acting.