It is worth considering that character creation is typically a communal experience in Fabula Ultima; you should use this article to familiarize yourself with the process.
Despite limited options for virtual tabletops supporting Candela Obscura, I think all three options ahead are strong contenders depending on your style as a Game Master and your players' needs.
Call of Cthulhu plays quite differently than the more heroic RPGs out there; the main conflicts are going to be more about investigating, uncovering mysteries, and simply surviving than they are about fighting.