I guess I prefer larger knives to smaller, as a general rule. Function and aesthetics are both more important to me than simple blade length, although I do try to carry a knife large enough for defensive use. My quest is to collect and carry knives that are something more than just huge black implements of death.
(Not that there's anything wrong with that...)
Most of the time I carry around a Sifu in an outside-the-belt sheath. I've been pleasantly surprised at the lack of reaction it has received. It probably helps that I live in Texas, where knives are still fairly common, but I think it also helps that I have one of the green-scaled models with a stone washed blade instead of a black-on-black.
My second choice for a defensive blade is an Emerson Commander, also green-scaled and stone washed. My third is a Kershaw Ken Onion Boa in a cheerful mixture of blues and purples with a satin blade. Women seem to actually like it. Almost no one finds it threatening.
Here are some of my others:
Mictotech LCC: titanium and carbon fiber
Benchmade 730: rose and black
CRK Large Sebenza: "Trailing Moon" graphic
Benchmade 940: bright blue
Benchmade 690: carbon fiber and rosewood
Spyderco Lum Chinese: leaf green
Spyderco Native: black with inlaid shell
AG Russell One Hand Knife: polished stainless
Spyderco Delica: royal blue
Camillus EDC: stone washed stainless
All of these knives are at least mildly interesting to look at in one way or another, even for a person who isn't into knives the way we are. Just by carrying and using them for normal day-to-day tasks I've gotten my friends and co-workers used to blades as a normal, non-threatening, and useful part of their scenery. A few of them have even become interested enough to want a
good knife of their own. The first step down the slippery slope...
Sorry, I seem to have a bad case of topic drift tonight. I guess the point I was trying to make is that small knives are not the only way to avoid freaking out the sheeple. I'll stop babbling now.
--Bob Q