Personally, for all your audio file needs, I would keep iTunes. As for the video ones, I would simply rely on VLC, which is way more efficient than QuickTime. Also, I don't know why you would need Java and Adobe products for audio and video files, but if you don't use them, I strongly suggest you to uninstall them as having them installed on a system is a huge security risk (vulnerability) as these are the most exploited programs to compromise a system.
So keep iTunes, install VLC media player, and uninstall QuickTime and RealPlayer. Uninstall Java and Adobe products as well if you don't use them, or disable them and only enable them when needed.
VLC website: https://www.videolan.org/vlc/index.html