I don't have a preference for or against dialogue prompts but I don't really like the way they're more "open ended" and can apply to many different situations. That's not really helpful for me, especially in one of these 'prompt a day' events where I have to think of something to write and fast. If the prompt doesn't have a certain amount of structure I get overwhelmed by possibility. Not that anyone is wrong for wanting the open-endedness! But personally I think they're just exceptional prompts, rather than there being anything inherently more attractive about dialogue prompts.
(Also I always feel awkward and weird about changing the dialogue into something the character would actually say, even if the meaning doesn't change. I write fic for a lot of fandoms where characters tend to have a more antiquated way of talking so this is often necessary, but I always feel weird and bad about it.)
it's interesting to hear different perspectives on this!
and they are great prompts, like i'm not mad about them getting so many votes, i totally get it