Mine varies. Today was an original Leatherman and a CRKT K.I.S.S. lockblade. Typically on a work day, it is the Leatherman, a SAK-Super Tinker is the model, and a small lockblade. Each has its preferred uses. If I need a small blade that I can open one handed, the lockblade. If I need a bigger blade or one of the tools on the SAK, then I have it. The Leatherman is usually used as pliers. But, the file also gets used quite often.
On a side note, this topic reminds me of another forum I frequent that deals with these types of subjects daily. :)