I carried a Kershaw A100 while in Iraq. The locking jaws was more handy than I would have thought possible in a relatively small package. When it was time to come home I passed it on to another soldier fresh off the plane. As far as I know, Kershaw stopped manufacturing the A100, which is a shame. A few years later I tried to replace it with a SOG EOD Power Lock (or whatever, at the time there was only 2... stainless and coated). It just wasn't the same so I don't carry it. The angle of the jaws was as much of a boon (on the A100) as the locking mechanism. IF I carry a SAK (which is rare), I carry the Cadet or an Adventurer (non-BSA).
To actually answer the question: These days I prefer a SAK.