I think some of the guys are being a bit hard on you. Sure, any of us would revert to firearms before blades to protect ourselves, I think that's fairly obvious. What they should just do is answer your question. After all, one can never be too prepared.
In answer to your question, I would carry a fixed blade and a folder. Depending on how you carry the fixed blade, size will be an option. If you can comfortably carry anything you want then a 6" blade like a SOG Tsunami, BM Nimravus or Gerber Mk II is perfect. If size is an issue then there are plenty of smaller fixed blades, like the BM Mini Nimravus, Gerber Mk 1 and Gerber Guardian. There are thousands to choose from but this is what works for me. You should also carry a folder but this would probably only be used for utility type tasks. Something like a BM 710 or 730, Spyderco ____ (fill in a model no.) or a SOG Vision would do the job.
The blade is just part of your kit, like OC spray and an ASP baton. Hopefully you have a vest and a shotgun handy as well. I believe in being prepared. Just last week family friends of ours were victims of a home invasion where 7 armed youths came in through the front door and took whatever they wanted and left with the family car as well. Yes, yes, there were lots of mistakes in the homeowners security setup, but the point is that **** like this happens and we can never be too prepared. So if you want to carry a knife as part of your kit then I say right on. I also say load that 12ga and make sure you have enough spare mags or speedloaders for the handguns.
The world is turning bad. Stay safe.
