Unity 3.5 Built-In Pathfinding vs Third Party Tools?

Would you recommend using Unity’s built-in pathfinding tools or third party tools? I’ve used neither.

Also, which third party tool would you recommend?

3rd Party:
Either Aron Granbergs A* Pathfinding in its 3.x incarnation optimally the Pro or Rain {One}, as both use Recast too to generate the navmesh like Unity does