Now Now your all pretty, theres no need to fight...lol
What if what the OP is really saying is, "I want a sword and I am justifying that want by saying it could work for self defense in a pinch, better than my broken lamp stand would" then could we answer his question without it becoming a debate storm?
I mean really who "Needs" a reason to buy a cool blade? I know he said SHTF but I think we cleared that on the first page. A long sword is dificult in CQCB a shorter sword is better for that, and a traditional Katana takes a lot of practice and skill to use well without ruining it. So realisticly you probably dont want either of the 2 swords you mentioned. There are a few non traditional waki style blades that might work better. The Busse and Bussekin wakis are well reviewed, and the Hanwei Banshi seems to be reviewed well for toughness also. Shop it around, if your looking for a defensive blade, you could even get one custom made. If you just like the two original swords just because, then pick the one you like the most, and who cares what we think ..lol