I actually think Bark actually beats Eleven right now. Bark tends to add a bit more of a metallic twinge towards the end of longer audio segments (I wonder if this is a bug and not a limitation actually...), but Bark is more expressive.

The trick to exceeding Eleven quality is using multiple speaker prompts, and swapping them in and out over the course of longer texts. Each is a slight variation on the original. If you hand tune the swaps it's super good, but if you just swap in 'beginning of new paragraph' 'continuation speaker' automatically, that alone is a huge boost.

I don't have a clip handy but I will make a YouTube or something this week, because the quality is wild if you do this. There's some passable audio clips on my README here https://github.com/JonathanFly/bark but all those are just using the same speaker for every line. That was all just the first samples I tried, from weeks ago, without really putting any effort into it. You can do a lot better.

The extra expressiveness of Bark does come with it being harder to control and having a bit of a mind of its own at times. (And this can also be very very funny: https://twitter.com/jonathanfly/status/1657658109001596929)

So for a production or real time use case Eleven makes more sense. For example even my best speakers will switch to a new voice mid prompt, once in awhile. (As if the audio clip was from interview segment.)