Its hard to say really, that's why I said it depends what you listen for. Voice definitely goes above 3.8KHz, it also (not so much female) goes well below 380Hz. If you are sensitive to phase at the frequency extremes of the voice and imaging then the AML1 will likely win out. If you are more sensitive to the midrange of the voice the 3-ways will probably fit you better.
In my experience from mixing music and building speakers the frequency extremes, especially around 150Hz-400Hz, of the voice are just as important as the rest and 2KHz-4KHz are very important for electric guitar.
However, the MB2 definitely give a very exciting performance regardless.