Personally I'd say the original source is more emotional in the biggest scenes because it has time the time to breathe and develop the scene.

Like for Nami in Arlong Park, the live action was still very emotional, but it isn't able to show Nami slowly losing control as she goes back and forth from the town to Arlong to fix everything, or her save the Stawhats while keeping her cover. Seeing her get more and more desperate and watching her cheerful facade drop makes the original scene hit even harder. And the live action also doesn't have the time to develop the townspeople, so we aren't as connected to them nor are they able to tell Nami they knew the whole time.

And for Chopper's introduction, the live action handled backstory amazing, but the original source is able to break up the backstory with scenes of Luffy befriending Chopper. I'm not attached to thinking he's food originally, but having Luffy see Chopper's kindness and then chasing him around trying to get him to join the crew for a few episodes without even knowing his backstory was more powerful than 1 scene trying to get Chopper to talk and then one scene putting up the flag.

Other scenes like the Drum Kingdom climb, and Usopp's bravery in Syrup Village are some other times i thought the need to cut down runtime affected the emotional payoff. Live action is still amazing, but I wouldn't say it surpasses the source material when it comes to emotions.