Both include BalancedOpticalSteadyShot, which moves the entire lens module (not just specific elements) for much more effective stabilization, especially when zoomed in.
We had an opportunity to check out both camcorders, and were quite impressed, especially when it came to the BalancedOpticalSteadyShot and (relatively) powerful built-in projectors.
We were't able to record and review footage, but zooming seemed smooth and responsive and the BalancedOpticalSteadyShot appeared to assist with stabilization, especially when zoomed in.