Confession. I hate chapter titles. I think it comes from when I was younger, reading chapter books, I could predict what was going to happen in the chapter based on the title and picture. Honestly, snotty child that I was, I felt like they were insulting my intelligence. So, to this day, I tend to ignore everything about chapter headings--chapter number, quotes, title, POV shift (part of the reason I have issues reading POV shifts). I've only allowed one of my clients to retain chapter titles, and that's because they're awesome, relevant, and give nothing away about the plot (that I can tell, maybe there's a whole other layer I don't get--I'm okay with that).
|Because I feel like being cheeky|
Here's another thing about chapter titles. When reading, I get so totally absorbed into a story that I completely forget that I'm even holding a book. So chapter titles, and anything that draws me out of the story, is super annoying.
Of course, there is always a time and a place.
POV shifts, especially first person POV shifts, do need a designation. However, make sure the voice helps the reader shift. If your two characters sound exactly alike, there's a bigger problem going on.
Part 1, part 2, part 3 with titles while chapter titles just have numbers. When this is done well, and the Part titles are clever, relevant, and make me go, o okay I get it, I'll go with it.
If you do have chapter headings, or even just the chapter numbers, do not make them fancy in your ms. There is a chance it'll get lost in translation. Set them either to the left or center, same font as the text, bold or italics if you must.
And that's my very personal opinion on the subject. It is, as many things in this business are, subjective. Some other may have differing opinions to mine, or even no preference at all. If you want to keep your chapter titles, be my guest. I will not discriminate when considering your ms. If I sign you, I will, in all likelihood, make you scrap them.