Here is another video where I see a book-matched four piece wedge top on a plus model compared to a two piece top on a standard Koa model. I hear less difference here, but that could be due to the playing style being much heavier.
https://youtu.be/Mbd3xYKN7X8
It could be my ear, but again I hear warmth and bass from the four piece, but more brightness and glassy high end resonance from the two piece. It sounds like the four piece can be driven just a little harder. Both top constructions sound fairly similar with a classic koa tone though.
Maybe I am biased because I’m a strummer and because I have a four piece, but I prefer the four over the two in both of these videos (Casino and Alamo) and also when I have A/B’d these in person.
In terms of construction-only tone impacts (not considering string type, gauge, or playing style), the top piece count (two vs. four) might be third or fourth behind top wood, guitar size, and possibly bracing, so not a primary but definitely a secondary consideration if one had a choice.