This is really difficult because I really like them equally. I would probably go with
Jonas though because it's a little less popular and
Jonah appears to be on the rise in popularity. However, I don't know if popularity matters to you because it doesn't always to me. :)
Despite everything, I believe that people are really good at heart. -
Anne FrankGreat Spirits have always encountered violent opposition from mediocre minds. -
Albert Einstein