The Bruce has 20 feet of chain (on the bow) followed by 50 feet of 3 strand, follwed by a swivel where you can connect the Danforth with 30 feet of rode. When I leave the boat unattended, I hook the Danforth rode to the swivel. After that swivel, I have another 30 feet of chain (that acts like catenary) followed by 100 feet of 3 strand. Believe me, the boat is not going anywhere once set.
Have you ever had trouble with the Danforth pulling out and not resetting? If it did, then you would just be down to a Bruce 22. I like the idea of being comfortable enough to leave the boat at anchor for an extended time, just not sure what that setup would be for me.