Unlike Antarctica, the Arctic has residents, sovereign states and settlements. That changes the whole shape of a voyage: you are travelling through inhabited territory, community visits are a normal part of an itinerary, and the rules come from national governments rather than from a treaty.
The three areas work quite differently. Svalbard is a compact Norwegian archipelago sailed as a round trip from a single town, and it is governed by some of the strictest environmental regulation applied anywhere to passenger shipping. Greenland is a long coastline with two very different sides: an inhabited west with icebergs and settlements, and a nearly empty east dominated by one enormous fjord system. The Northwest Passage is not a cruising ground at all but a transit, sailed in one direction through the Canadian Arctic in a window of a few weeks.