I always carry two knives, one larger folding work knife and a smaller traditional. Both get used during every work day on the job. If one gets used enough to get dull, I get another out of the box for the next day. Depending on what I am doing on site I have my favorites like my SR1 or Harnds General or even the old RAT1.
Smaller pen knives or medium sized traditionals are used to dig splinters, cut my cigars and do other small, sliced duties.
When I was a young man, I carried one work knife that had to do it all. That went on for several years as I couldn't afford another knife. Now, a few decades later, I feel pretty spoiled to be able to pick the knife I want for the week.