Visual Sutdio is based on electron, just like Atom. So, same engine, not open source ? I'll pass :) Glad that you found your editor of choice though :)
Both are based on electron, But on atom it took a while to open the editor and while working on big projects, it perform slower day by day, But on VSCODE it open up quicker than atom, also it does not perform slower as i am working on the same project.