Adam has a very rare tessitura (tessitura is the part of a person's voice where they are the most comfortable with/sound the best, as opposed to range, which is how high/low a person can reach with their voice). Countertenors are VERY hard to come by, and my gosh Adam is a true countertenor... he doesn't even need to go into falsetto to reach some of the notes that normal males would find hard to reach even in falsetto!
I'm rooting for Megan now (since Alexis got the boot :cry

. Megan has a very pleasant timbre in her voice, like Pink except magnified. She is like the polar opposite of Adam, she is a contralto (which means she can go very deep and still sound amazing

).