Samsung Galaxy S9 mobile phone vs Samsung Galaxy S23 Ultra mobile phone

Hey, I'm having a hard time figuring out something so any help would be highly appreciated.

What I'm trying to figure out is which of those two mobile phones plays music louder through the speakers? Samsung Galaxy S9 or Samsung Galaxy S23 Ultra? I'm not referring to anything with headphones, just the phone speakers themselves.

If I was to play the same song on Pandora on both phones, which phone would play the song loudest on max volume?