I use an 8kg Brittany anchor on my BC20. It is like a Danforth, without the long cross bar, which allowed me to fit in a heavy one. I have about 10ft of chain which must nearly double the total weight of metal. I can squeeze both anchor, chain and rope into one bow locker, but it is very tight, so I usually put the rope and chain in one locker and the anchor in the other. I always go forward to drop the anchor, I don't like having it in the cockpit. It has only slipped once, when I pulled in the rope until it was straight up and down, then got distracted (easily done) and when I finally remembered that I had been planning to set off, I had drifted 1/2 a mile down the Wareham Channel in Poole Harbour.
I am sceptical of the value of many anchor test articles. They are really aimed at people planning to anchor 40ft yachts in 50m of water whilst they sit out a force 12 hurricane in the Caribbean. I rarely anchor in more than 2m of water, and if things look bouncy, I drive her up the beach on a falling tide and sit it out on the ground. Having £300 pounds worth of aeronautical aluminium in a hydrodynamic anchor up front seems a little bit OTT. (Hope I don't live to regret saying this!)