Utility knife. In my world a good utility knife has a few must have characteristics.
The first characteristic is there must be NO WAY that the stored blades can sneak out. Yes, I've run across utility knives without a "lip" in the two halves, which allowed the blades to sneak out and slice the heck out of the user's palm. Fortunately, I noticed it before it sliced my hand. Such knives immediately have all blades removed on the way to the nearest trash can.
Second characteristic: Bright colors. I want to be able to find the damn things when I set them down/drop them.
Third characteristic: Retractable. This, of course, is personal preference. Some folks like the fixed blades. Not me.
Fourth characteristic: Easy blade change. Preferably not involving a slotted screwdriver.
Fifth: Comfortable in the hand, no slip.
Currently, my go to utility knives are made by DeWalt and Milwaukee. Less than $10 each.