You might give these a try if you haven't already done so.
https://www.techradar.com/best/best-text-to-speech-software#2-natural-readerThis link uses the TTS voices you have installed on your computer to try various words and phrases.
https://ttsreader.com/Some voices as Lightspeed mentioned, don't always pronounce words correctly like wound and wind. The knife caused a wound on his hand. He tried to wind cloth around the wound but the wind blew it away. Now, we have two instances of the word wound and two of wind but both should have different pronunciations. See how accurately some voices treat them. That is a test that I sometimes use when trying a new TTS voice.
Depending on your purpose be sure to test any TTS voices before you purchase them to avoid any dissapointment.
You can also list some contractions like can't, don't, won't, couldn't, shouldn't, wouldn't, they're, you're, we're, they'll, we'll, etc.
Good luck!