Really depends on my mood. I recently received my Spdyerco Tropen, so I've been T&E'ing it the past week or so which I carry as my "primary" folder. I carry a few knives, simply because of my environment is more permissive and I can.
So my primary (right pocket) rotates between an Emerson CQC8, Protech Magic 2 Whiskers, Benchmade Adamas auto, and now the Tropen.
Weak-side (left) pocket rotates between a Benchmade Emissary or the Benchmade Arcane. Both of these assisted folders are perfect for weak-hand use and I love their thin-blade profile. If I go "big", I love Hogue's 4" X5 flipper and it has a very functional left-pocket clip. Another one that gets added in is a Spyderco Para-Mil with a left-side, deep pocket clip...it's a very utilitarian design.
Back-pocket, (right) strong side rotates between a Spyderco Yo Jimbo 2, or a Boker Urban Trapper frame-lock, and now the CRKT Slacker. All of these are excellent utility blades.
Last folder is my back weak-side (left) pocket and where I also carry my wallet. The dominant folder that gets carried consistently is my Microtech Ultratech. It just so happens to have a tanto blade, but it fits the location perfectly and is used quite often as it's so easy to access, open, and close one handed. Plus the Germans I work with always get jealous
I also carry a fixed blade, small of back, in a scout-style Kydex sheath (both from Armatus). I rotate between a TOPS CUT 4.0 and an ESEE 3. Both excellent blades, but the ESEE is a little more utilitarian. Choice depends on my "combat casual" attire of the day.
Oh, I have a Victorinox Spirit X in a Blue Force Gear mag-pouch (elastic) sheath as well...very svelte and when needed, it's extremely handy!
I have other blades, but these are the primary choices. They just seem to work for me and my occupation and I enjoy a little variety in life.
ROCK6