For so many years, in so many situations and for so many purposes the ONLY knife I carried was a Buck 110. I have owned @ 10 of them. 1 broke. 6 disappeared and I still have 3 'originals'. I just bought a new one. I believe in the inexpensive workhorse over the more expensive pedigreed 'knife de jour'. I have always trusted them. The 110s performed all the cutting, chopping, hammering and digging chores I ever threw at them and (though they got ugly) they continued to be functional with a minimum of refurbishing.
Yes. Digging. As an archaeologist I am required to do some digging.
It is large enough for defense and can be lethal without opening the blade.
The grip, though wood and brass, is secure even in mud, oil, sweat, blood (mine too), beer, billboard paste (like snot), cold water, hot water, sap, with gloves and in the dark.
That is my vote.