My problem with Google is that sometimes the voice becomes "metallic" on some portions of the text. Not having that would be nice. Also perhaps some randomness.

My problem with Google is that sometimes the voice becomes "metallic" on some portions of the text. Not having that would be nice. Also perhaps some randomness. When saying the same few words twice, there could be a little variety. More generally, I am also wondering who has the best tech currently (assuming the answer is settled enough).