There are many weapons more powerful than the blades of the fallen and even frostmourne, so saying its without equal means nothing in comparrison to how strong it is.
The weapon itself is nowhere near as strong as frostmourne, you enjoy talking complete nonsense to try and justify why frostmourne should be a transmog.
There is no lore or information saying they are stronger than frostmourne or even have all similar powers to frostmourne.