I don't know if it's the "best" rod action, but my preference after using many different actions is the "fast" or "very fast" action tip rods. Not only because they cast lite baits very well, but because they set the hook faster/harder than moderate action rods & I don't have to raise the whole rod/reel & my arms above my head when setting the hook.

My current casting rod of choice is a ESP Power Lite 6'6" very fast action spinning rod.