This week's book giveaway is in the Other Languages forum. We're giving away four copies of Functional Reactive Programming and have Stephen Blackheath and Anthony Jones on-line! See this thread for details.
There is no single "best" framework; it depends heavily on what you're trying to achieve with the framework, your application design, your (or your team's) pre-existing knowledge, and several other factors about which we know nothing.
Let's start by what you would like the framework to do for you. Can you tell us more about that?