A new ball on the first tee of a new round every time. After that if by some rare chance a ball makes it a whole round I put in the bag for later so if during a round that I'm spraying and praying a lot I'll use a old ball. If a huge or deep cut shows up I'll swap it out.
I had to check the name for who wrote this because I would’ve said the absolute identical thing.
I always tee up with a new ball on the first tee. If I hit a ball out of play, in the water, etc, my drop will be with one of the few “used” balls in my bag. Depending on how I’m feeling at the end of that hole, I’ll either keep playing with it or pull out a new ball on the next tee.
Something mental for me about teeing up on the first tee with a new ball. It’s just a requirement to get my head in the game.