Alot of good asnswers and differing opinions.....
...but that is wht forums are all about.
For along time I just packed a pistol, most times I had a small flashlight that I could also use as a yarweh.........but then I got into a 'situation' where I decided to add OC to my daily carry.
I found the ASP Street or Key Defender to be an excellant and versatile. Not only do they pack some good OC with a positive locking device on the 'trigger', but it makes a great kubotan/yarweh stick.
There are times when lethal force is not viable and you do not want to escalate the situation. The ASP give two options of defense in your hand, while you do nothing more menacing than hold your keys.
I also feel that if you ever have to go to court, having had a less lethal option will be looked upon favorably.
Me...an old marine grunt....I break contact...avoid potentially violent situations and stay aware. I walk away and do not return any of the insults some lower life form is using to try to get me to start something.....it a game to them....act macho, get you to start it and then hit you with a lawsuit later.
If it looks like it is going to get real nasty, I transition the ASP to leve th strong hand free for Mr. Colt....and I start giving forceful verbal commands.
If it goes beyond that, theory goes out the window and survival tasks over.
I still carry a flashlight daily...the old Surefire 6P has been reassigned to sidemount duties on my AK, the NightOps Gladius, with its LED and strobe function has replaced it for carry.
And I have an EDC blade daily/tool as well....cuz I try to stack the odds in my favor.....