3 ways typically have greater frequency range, dynamic range, and can more easily keep the cross-over out of the area most sensitive to human hearing. Comparably priced 2 ways often have less box resonance, bass to room issues and sometimes better imaging. Unless dealing with a smaller room, I've yet hear circumstance where I wouldn't prefer a 3 way. YMMV!
two way v. three way speakers
I recently heard some magico mini's at a friend's house. They sounded amazing. And they were 'only' a two way speakers, but they filled the room with amazing sound. So now I wonder, what does the additional driver add, especially when it is the same size as the second driver. For example, the SF Olympica III's have two drivers of the same size. I know that third driver adds a lot to the price, but what does it sonically? Thank you all in advance.