Windows or Mac? There are currently various bugs regarding TTF / OTF fonts on both OS in the current public builds.
On Windows if you enable borders / shadows then the spacing between words seems to broken.
On Mac if you enable borders / shadows, then the text will not display at all.
In regards to TTF / OTF fonts, I have no idea whether or not every single font file will be compatible with Visionaire Studio. My suggestion would be to just try them out. There are hundreds of decent freeware / royalty free & cc licensed fonts available on dafont.com