This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The relative goodness of an operating system is highly context-sensitive. To start with, if you're running Sun hardware it's best to go with Solaris, if you're running HP hardware it's best to go with HP-UX, and if you're running IBM hardware it's best to go with AIX.