I’m using Google (English UK, voice 5) at an accelerated speed rate, but if there’s better, I’m definitely interested.

I use rhvoice which is not the best by any stretch, but its good enough and its FOSS

I used to have an Chinese app called TTS that I found on Reddit that could connect your TTS reader to using Microsoft’s premium voices, god that was awesome. I used an app called Read Aloud, those were the golden years. Since I can no longer use MS voices and ReadEra Premium started offering TTS I just uninstalled the two above.

ReadEra Premium gives you some network TTS options but they are only Good. Not sure if the free version offers TTS.