Chronographs are pretty useful. Frankly, so the rotating bezel on a dive watch and that isn't even a complication. I think I use the latter more. but that is because I don't often find myself needing to time sub-minute intervals. But if i did, the chronograph would be better. But for, say, needing to time 12 minutes, or two and half hours, or the like, I prefer the big bezel to subdials.