Explain which is better at performing the given tasks along with your reasons, experience or opinion. Granted, not all possible uses and comparisons are listed here, but a general list. There's a lot of discussion that Vista may be better than XP at some things, and XP better than Vista at others, so what are they specifically? Give your choices to these below and more if you feel.
Internet & networking stability: How stable handling internet content is, ease of setting up networking properties basic and more complex, etc.
Software & program stability: How well programs of different types run on the OS without having random glitches attributed in some way to the OS.
Software & hardware compatibility: Which OS supports the best hardware more readily, the most software more readily, and has fewer issues with different programs running on the same system.
Content security: Which OS offers better security against such threats as viruses, malware, etc. Take into consideration the amount of space and resources required to do so, the amount of "interuption" this causes to the rest of the system or other programs, and the ease of use and effectiveness.
User security: Which OS protects better against user's errors or problems that could be caused from a user manipulating or changing system settings. This also includes protection of user's information both from outside interactions from the internet or similar, and from other user accounts on the same
computer.
System manipulation: Which offers better ease of customizing, fixing, debugging, or resetting system configurations and running administrative tools?
Asthetic modifications: Which offers more options and which is easier to work through without problems integrating or working with applications?
Scalability & system flexibility: Which offers the highest amount of scalability from a simple desktop to several networked workgroups or being used to host a server even? Which can handle upgrades to the system best and with more ease such as hardware upgrades?
Media Performance: Be it through third-party software or integrated, which can show media of different types better and is simpler for the user? Be it playing movies or photographs, which offer the best options and customizations, as well as support for different types without interference to use the media?
Other Comparisons: Any other large comparison that I've left out based on the same computers running XP or Vista.