Rocna and Mantus anchors are very well made with ultra high holding capabilities. Our boat is much smaller than yours, a 25SC. We also have the Mantus Swivel and I highly recommend this no matter what anchor you choose.
On our little boat we utilize a Mantus 25 pound anchor along with the swivel and factory supplied 50 feet of 5/16 chain and like 160 feet of 5/8 3 strand nylon rode.
The 25 seems like over kill BUT, we trip south Florida, Great Lakes and upper Mississippi River. We have been caught anchored for the night in strong current, strong tidal swings and up to 35 knot winds … our Mantus kept us safe with no dragging. It sets extremely fast, even in hard packed sand, gravel bottoms, heavy sea grass etc.
My lighter factory anchor does not set as fast, is real hard to get a good set in sea grass ( like south Florida), or heavy wind and current.
Good luck with your search for a better anchor. If you spend many nights at anchor you may want to look at a Rocna or Mantus a little heavier … maybe like 30 pounds or more ( just one man’s opinion ).
Bob.