The only sample I found arguably better than AWS was Female B. The others were too close to an uncanny valley (Professor, Entrepreneur), or the cadence was all over the place (Male A and Male B).

I spend a lot of time listening to AWS's text-to-speech. It can be distracting at times. But with Unreal Speech's text-to-speech, I'd lose focus incredibly quickly and focus on the issues with cadence or general weirdness (Professor's pitch change is too abrupt, and weirdly gets caught on the word used which throws off the cadence of natural speech).