Pro Commercial support
Aurelia has commercial support and is an official product of Durandal Inc.
Other frameworks like React and Angular are not official products of Facebook and Google. They're not even related to the core business of those companies (advertising). You can buy commercial support for Aurelia and not have to worry about being left without an upgrade path (NG1 to NG2).
Or be told that software is at Release Candidate 4 state on one day and then be told the router is being rewritten the next followed by splitting the code-base into dart and typescript versions. (guess which version google uses... hint: not the typescript version).
Con Self-paced training options are very limited right now