- easy to use
- compatible with almost all file formats
- runs fast
- doesn't lose files/data
- looks good/aesthetically appealling
- compatible with most or all of the programs i want to run
- secure/safe from malware and criminals
- can handle multiple people logged in
- can run a lot of programs
- doesn't crash
- standards compliance (like SUSv2 and RFC compliance)
- doesn't need reinstalling
- inexpensive
- availability of tech support
- availability of cheap tech support
- legal
- compatibility with file formats
- overall cost of purchase
- philosophical free software
- ability to run on old or cheap computers
- private
- powerful
- peaceful
- pleasurable
- neat programs
- fun
- independence and counter-cultural status
