ok... well I don't give a rat's ass about UI either way. Never changed foobar from its default
I guess it's good to use foobar over itunes just so you know you are pretty much getting your input signal out pretty much the same, without hidden stuff like Sound Enhancer getting in the way. And stuff like WASAPI bit perfect output--like I care about that
I don't use foobar2000 for sound quality. That doesn't make any sense in my opinion.
Though I would definitely hate some mysterious behind-the-scenes feature alter my sound in a way I'm not 100% aware of.