Game Booster and Jet Booster

There are two free boosters on the internet, one most of us know: Game Booster. The other one is fairly new: Jet Booster. Has anyone tried them both, and if so which one works the best without being overly intrusive?

I use GameBooster exclusively. Simple yet effective. Don't know how much of a difference I've noticed but it claims that whenever I turn it on, it saves around 60-100mb of RAM, and the processor isn't working as hard when it has shut down the programs.