Sometimes you might require some additional commands, other than the ones Volo provides; Volo has you covered in these cases as well. The package manager is extremely extensible at its core, and can be easily modified and extended.
Volo also allows you to provide a volofile that lets you run various tasks. Volo provides a helper object for running cross platform command line commands, and also allows you to use binaries in node_modules or create your own.
Volo is based around AMD, which is great for asynchronous loading, and if you try to add a non-AMD package, it will interactively ask you for its dependencies and exports.
Volo installs components directly from urls and repositories, which makes it more susceptible to components being taken down, with fewer guarantees about their availability.