I have one of those mini marlinspikes. The tip was too blunt to get into tight knots, but I was able to file it into a better shape and now it's a pretty handy tool around the boat.
That's a nice looking knife but a too pointy. A good rigging/yachting knife has the profile of a small meat cleaver, with a blunt "point" that won't poke people or things on a moving boat.
To answer your question; this is what I use:
I actually carry it as my pocket knife. The marlinspike is too small and sharp to be useful for anything other than cleaning my fingernails but the blade is great. It holds an edge surprisingly well and the knife was dirt cheap so I'm not afraid to abuse it.