The short answer is... Hell yes J River is better. Its impossible to output in ASIO with the PC version of iTunes. There was a workaround with an old plugin called multiplugin that allowed iTunes to act as the GUI for Foobar2000 but It is no longer supported.
If you're not into bit perfect output just stick with iTunes because the kmixer is going to make all media players sound the same anyway.
If you're not into bit perfect output just stick with iTunes because the kmixer is going to make all media players sound the same anyway.