Azure Cognitive text to speech produced good audio in my limited testing. You can run it out of azure by the way. The nvidia text to speech research is also go

Azure Cognitive text to speech produced good audio in my limited testing. You can run it out of azure by the way. The nvidia text to speech research is also good, but it’s not really on the market. On the edge, some cerence voices are fine. Actually better than some cloud text to speech solutions.