The biggest factor in your anchor biting and holding properly is proper geometry for the type of mud/sand or rock bottom you are usually fishing followed by putting 6'-10' of chain immediately above the anchor to allow it to rest properly.
The other thing I learned, is 99% of the guys don't set it properly. 3 times the rope vs the depth at minimum - 5/1 is better.
If it's set up and deployed correctly a 15lb navy or danforth type is a decent "all around" anchor for most conditions here for a boat that size.
It does take a little "planning" to let out enough rope (if you are setting up wind or in current) so that when you drop and set, you can let out so you are over top the structure you want to fish.
On a clam day - this is less critical.You could get away with hovering the spot, driving a little up wind or upstream and plop and drop and if there's no wind you are usually OK.
I usually find the spot, GPS mark it, move upwind/upstream a bit, drop it, give it some slack and a good bite then feed the rope out as I "back into" the spot I want to be over and that usually works good.
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