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.
Choosing right one for you depends on the requirements you have, for example if you are looking for high number of concurrent visitors and have requirement for High scalability and performance, Data management and Enterprise document integration such as PDF etc then LCDS would be the ideal choice otherwise BlazeDS.
Please refer comparison chart for making your choice.