Cherry picking one of the AWS voices is a bit fishy to say the least and Azure is running away with the quality of their voices anyway.
Hmm, I've been in the space for a bit, and I think it's not unsafe to say I picked the best voice AWS provides. I could've implemented a multi-speaker feature for AWS, but I just didn't get a chance. I did try IBM, but it sounds worse than AWS?
Azure is Microsoft.
Oh, I meant to say Azure. Not sure why I typed IBM.
If you build a product no matter what you have to be honest to yourself and imho most of the neural voices from azure sound better than your example. They may miss some of the tempre of your voices but the tempre comes from the examples you fed it... tbh it's not much better than doing it yourself with something like https://github.com/neonbjb/tortoise-tts