I prefer moving to a cutting board and using a pizza cutter for thinner crusts. For thicker crusts, I use a bread knife; I feel like a pizza cutter or chef’s knife compresses the crust.
However, if I had to choose just one, it would be scissors. Right out of the oven, scissors are the easiest. Especially if company are over, no one can wait even 5 minutes. I’m can cut directly in the pan, or on a cooling rack, or on a foil-lined plate. I only have one large cutting board. If I’m at someone else’s place, it’s not even a question. The only large cutting boards are glass. Knives aren’t sharp. Pizza cutters are death traps. (Two weeks ago, I tried to use one and the handle fell off. Fortunately, I wasn’t cut too bad. ) Even second-rate scissors will do the job.