ckatt said:
Any chance you could post examples of what the voices sound like?
and is there any major functionality difference between the two of them?
There'll be samples you can preview from the 'Add-ons' screen in the finished release - haven't got the links for them yet.
Functionality-wise, Hui seems to do a slightly better job with characters-with-multiple-readings at the moment, and while we haven't yet integrated this in Pleco (having only recently even decided to use both engines - this may actually make for some fun possibilities later for TTSing dialogues and such) it also has more fine-grained support for following along with where it is in the text as it reads.
But both engines are still being actively developed and either one could add a new feature in the future that the other one doesn't have, and we never know what sorts of roadblocks we might encounter as we try to integrate a particular feature in Pleco, so we can't promise that either of them will do any specific thing in the future that it doesn't do now, and right now the only difference we're aware of is that Hui does a slightly better job with ambiguous characters.