Best OSes:
10-5. Amiga OS
4. Mac OSX
3. Windows XP
2. Android (Phone OS count too right:)
1. Windows 7
Now for my favorite top 10
10. Mac OSX
9. Mac OS9
8. BEOS
7. Windows 2000
6. Windows XP
5. Windows 7
4. Amiga OS 1.2
3. Amiga OS 3.1
2. Amiga OS 3.5
1. Amiga OS 4
My Honest Opinion!