Crikey this is a hot topic!
People feel very strongly about their "hooks", fortunately less so on here than on some forums I could mention.
Several points here, all my own opinion and probably in contrast to the subsequent posters...
The size of your anchor is not nearly as important as you think, they are not weights to hold your boat in place they are mechanical devices that work by gripping when dragged horizontally along the seabed.
The exact type that suits you will vary on the storage you have available and the type of ground you generally anchor in, ie some work well in sand, some in rock and some in weed.
Folding grapling anchors are generally referred to as lunch hooks
, which is all they are good for. They have no mechanical properties that help them hold your boat in place.
Chain is absolutely vital, the more you have and the heavier it is the better your anchor will work.