It depends on what I'm writing.
In my urban fantasies, I've just gone with numbering, with "Chapter" in front, as supplied by my word processor. In "Streamrider" I gave the chapters titles, because although I was pantsing it, I had some sort of idea what each chapter was about and the title acted as a handy mnemonic, so "Chapter 1 Bluesky" is all about an introduction to the pseudo-world of Bluesky, next came "Hive" which introduced the Hive Queens and so on. Looking at it now, I see that many of my titles deliberately have multiple meanings, which is again about reminding me of what is going on.
In the current WIP, with multiple 1st POV narratives, the chapters are numbered sequentially and have the name of the narrator for the title.