I did 12,000 miles between Puerto Rico and Venezuela in a 38-foot motor yacht. Anchored 1,000's of times. Like airshot said, different anchors for different bottoms. I had five anchors and needed and used them all. The one anchor that was the most reliable was a Bruce, 15 kg(33 lbs). It was a ***** to retrieve, without a windlass, but would almost always hold. They will hang up under an immovable rock, tree stump or piling, so you need to attach the line to the back end trip line hole, and then use multiple big zip ties to bind the rope to the front end. If you get stuck under a giant rock, the zip ties will break, letting you get your anchor back, by pulling up on the back end. Carry lots of zip ties. CQR Plows were the next best, but won't hold in some bottoms. Danforths are great, but won't hold well in grass bottoms. I use a 2 kg Bruce on my 14-foot tinny. TexasJim