This app was mentioned in 2 comments, with an average of 1.00 upvote
It's very subjective. Try the different English accents in the Google settings, or the Play Store https://play.google.com/store/search?q=tts&c=apps&hl=en this one is fun https://play.google.com/store/apps/details?id=com.cereproc.Dodo&hl=en
Here is a Scottish one. Btw what you are looking for are called text to speech(tts) programs so googling that might net you some neat results.