I want to say that the Agent Rocker is stiffer than the Reverb Rocker but don't quote me on that. The Agent is a directional and would be a great all mountain/freestyle board. Excels in the park too. Easy to ride switch on - its techincally a directional board but only slightly - its shape is easy to ride switch with.
I think you'd have more difficulty charging on the Reverb, as its aimed more towards the park.
The Agent is stiffer, it will be my all mountain and won't go in the park as i plan on having the edges sharp all the time.
Go to EVO.com and read the description of both boards