Below is from a similar thread by Qatman in the advice and help section

PC Magazine conducts OS battle: Results based on ratings

Price (on scale of 0-5; 0 is worst, 5 is best):
4.5 - Ubuntu
4.0 - Mac OS 10.5.1
3.0 - Windows XP
2.0 - Windows Vista

Installation:
5.0 - Mac OS 10.5.1
3.5 - Windows Vista
3.0 - Windows XP
3.0 - Ubuntu

Interface:
5.0 - Mac OS 10.5.1
4.0 - Windows Vista
3.0 - Windows XP
2.5 - Ubuntu

Bundled Software
4.5 - Mac OS 10.5.1
4.0 - Ubuntu
3.5 - Windows Vista
2.5 - Windows XP

Third-Party Software (Quantity, not Quality):
5.0 - Windows XP
4.5 - Windows Vista
4.0 - Ubuntu
3.5 - Mac OS 10.5.1

Drivers/Hardware (Quantity, not Quality):
4.5 - Windows XP
3.5 - Mac OS 10.5.1
3.5 - Windows Vista
2.5 - Ubuntu

Networking:
4.5 - Windows XP
4.0 - Mac OS 10.5.1
4.0 - Windows Vista
2.5 - Ubuntu

Security:
4.0 - Mac OS 10.5.1
4.0 - Ubuntu
3.5 - Windows Vista
3.0 - Windows XP