[kevinb7]

Typr.js doesn't seem to have a way to write out fonts after editing them. In what way is it more versatile?

[IvanK_net]

You mean writing a font back into a font file? Yes, this feature is not available now.

OpenType.js throws errors for many font files. It supports just a specific subset of standard font structures. It also renders some glyphs incorrectly. Typr.js does not have these problems (at least not during my testing).