I don't think the question was "What is the best keel?" but rather, "What do you like about YOUR keel?".
If that is the case... then hard to beat my lifting weighted daggerboard for trailering, or gunk-holing.. Boat literally can float in 18 inches of water (board up), and it's a self-righting boat, even board up...
Downside? If I run aground board down, I might very well, destroy the dagger trunk, or worse, compromise the hull.
We have a very stone-laden bottom lake that is nicely average depth of about 24 feet. The edges drop off nicely mostly around the lake, but there are a few places that one must not sail. I've been lucky - so far.
Prior to the present boat, I had a deep fixed fin keel. Prior to that I had a fixed wing keel.
Loved how the fin sailed (probably best of the bunch), horrible to trailer launch.
Loved the wing keel to launch, terrible point out of it though (boat sailed sideways until it got up to speed.
So among the 3, I'd say the lifting weighted dagger is the best compromise.