PBSBAC should write a booklet on the pros and cons of anchoring, this our most discussed subject, every year it comes up. Especially when you have just lost your trusty anchor.
Perhaps we could have a refer to page on the site for FAQ and answers, it would make great reading as well as constructive information for our new members.
Having had both types of anchors, I prefer the delta type on the ground I anchor on mostly. The key to most stuck anchor retrievals is to make sure you connect your chain to the base of the anchor and cable tie or trip the chain to come loose under strain to the shank eyelet.
If you do not trip your anchor you chances of recovery will be reduced.
Also when anchoring over rocky ground, lift your anchor at the slack tide, have a drift for twenty minutes the re anchor your mark, this reduces the chance of the chain becoming entangled a round the rocks which is the worst way to get stuck in.