In an attempt to make their knives more versatile, more and more manufacturers enhance their rigging knives with various other tools. From this point of view, some rigging knives are better described as Swiss knives. They may come with bottle openers or shackle keys, among other tools.
The classic rigging knife has two tools only. It comes with a blade, as well as a marlinspike. Decide on what you need the knife for. If you spend lots of time camping or in the wild, you might need other tools too. If you only need an efficient rigging knife for your boating adventures, go for the classic design.