I like the Sound Quality on my Zune better, imo the iPod hisses at loud volume's and can be a little screechy. The Zune sounds more natural and balanced. So without any additional apps or Eq's I prefer Zune HD over iPod touch... but it's not the biggest of differences
Also I've got MDR xb700's and FiioE6 [soon to be E11] to boost my sound quality and I only listen to music and watch Videos so I could care less about "apps"