Deltas are great!
FWIW: We have a new Outbound 44 which we cruised for three months last summer around Vancouver Is., BC. We have a Spade 140 (66lb), Bulwagga 45 and a Fortress FX-85. We used the Bulwagga several times and it worked well-quick set and hold. But once we put the Spade on the roller we never wanted to change. In about 80 sets it failed to set only 1 or 2 times on the first try, and held fine in up to 30 kn of wind. Most of the ground was mud.
On previous boats we have used Danforth and CQR, and frankly, the CQR didn''t always set, although it held well when set. Not only does the Spade set quickly, it holds like a bear -- on several occasions we had to winch the chain (5/16" HT) vertical and let the boat ride to the chop for a few minutes to break it out.
The Bulwagga looks like a good anchor, but has more welds in its construction and may not be as ultimately reliable. We have not yet used the Fortress, which is huge but stows nicely in the bilge.