What are people using and what do you think the benefit is of the type you use? What type of yak do you use and where do you fish?
Where you fish, are you concerned about drifting and the anchor dragging into deeper water, thus causing a potential safety issue?
Just like anything fishing, I've heard polar opposite reviews about each type of anchor and wondering what the folks in here use.
Personally, I've been looking into something like this:
Bass Pro Shops Grapnel Anchor Kit
Threaded Mode