openFrameworks vs QML

I’m planning to develop an app like Steam Big Picture. It will be kind of a container app for games and it’s going to have some of the features Steam has (e.g Store, Downloading)
We’re working on an FX heavy design and I’m torn between choosing a framework for UI.
And I’m torn between openFrameworks and Qt/QtQuick.
Can you guys please share your experiences if you have any or your opinions on this?