Congratulations on buying Pegasus. I have P31 Phun and a few years ago decided to upgrade from the original 25lb CQR. It had never let us down but I thought that one of the new generation anchors would be more effective. I eventually bought a Kobra 2 14kg, which is the biggest Kobra 2 which will still go in the anchor locker. It was cheap and has worked well for several years.
At the start of last season I bought an additional anchor to serve as a stern anchor for mooring Baltic-style (the boat is currently in the Baltic and I failed to get my Fortress stern anchor to hold!). During research for this anchor I realised that the Kobra 2, although much better than the CQR, is still a plough-type anchor and it appeared that a spade-type anchor is better in all respects. So I got a Rocna Vulcan 9kg. Rocna anchors originally had a roll bar on top, making them hard to store but the Rocna Vulcan has been redesigned without the roll bar. So far I have only used it once, when moored bow to a pontoon. It worked very well and continued to hold well after the wind turned and blew onto the stern.
If I was looking for a new bow anchor I would measure carefully and see what is the biggest size Rocna Vulcan that would go in the anchor locker. Looking at the rocna vulcan sizing guide online it seems that the 9kg one would just about do for a P31. I would suggest you measure up for the 12kg one.
Pat Morgan