Both for me, but not at the same time. Got two stories, one is just a silly isekai. I do write 3 chapters on a whim, and then come back to it, but pretty much, there's no real planning aside from broad notes. My previous story, the one I call the Bathroom story, was definitely pantser, and it was clear that going all in without a premade plan was a bad idea. The story ended up going in a very dark and disgusting direction and I had to end it before it got worse. I know at least put some effort into making notes and get ahead a few chapters at least.
But I do have a story currently in production that is being planned meticulously to the point that it's going through a rewrite. I had 41 chapters already written and now I have to scrap them all because it was not going well. I'm barely writing a test draft to get feedback and I have no idea when I'm going to start writing the darn thing.
So yeah, being a pantser leads me to a dark and scary road, while being a plotter hardly gets me writing anything. How about that.