To choose between Ipod 4/8 Gb and Zune 4/8 Gb, rate them on the comparison parameters by entering scores (+ve or -ve) in the comparison tool.
The total points are automatically shown in the top row. This should help you decide.
On October 2, 2007 Microsoft announced a new array of Zune music players, including Flash-memory based 4/8 GB Zune models to compete with Apple's iPod On (80GB). These Zune models will ship in November - in time for the holiday shopping season.