The indie license is 700 a year, or 35 a month. There is no way this project could ever afford that! Right now, after about 8 years of work, donations have reached a staggering €40! Not that I'm complaining That's a good night out!
I think the 'personal' license, with the JUCE splash screen makes most sense. There are no on-going costs and I can produce a closed source version of JUCE without paying the JUCE license. Note that any closed source version will be the same as the open source version, apart from the fact that .csds will be hidden from the end user.