Well, it's changed considerably over the years...
Once it was just a Schrade LB7.
And then I discovered Swiss Army Knives! Over time I carried a bunch of different models...
Victorinox: Soldier, Electrician, Super Tinker, Recruit, Cadet, Pioneer, and Camper.
Wenger: Standard Issue, Trout, Handyman, Teton, Backpacker, Viking, Alpine--and some that I can't even remember.
And then I really started getting into one-hand-tacticals like Spydercos, Benchmades, CRKT, ect...
But no matter what tactical folder I carried, I still carried a SAK as well.
Lately I've come to appreciate the utility and options that a multi-tool offers. The only problem is that most multi-tools are too heavy or bulky to carry everyday.
So the search continues for a smaller multi-tool. The Leatherman Juice and the Gerber Compact Sport are leading the way so far.
But to answer the question...
Hiking around town it's my Spyderco G-10 Police and my Gerber Compact Sport.
In the woods it's the G-10 Police and my Gerber Pro-Scout (I replaced the RemGrit saw blade with Sears Craftsman wood jigsaw blade, and I have a saw-blade for metal in the sheath).
The only SAKs I ever carry anymore are the Victorinox Electrican and the Wenger Handyman.
Good luck,
Allen.