Hey Chris.

I think, especially with Vocalizer, this is more than anything down to
personal preference. There are differences in intonation, even
pronunciation. My favourite is Daniel. If I want a female type voice, I will
use kate (though is she available in any of the NVDA add-ons?). But the only
way to know is to try for yourself. I find the Daniel voice to be very
pleasant to listen to.