A voice call means they need my attention RIGHT NOW. (This is fine if it's during declared "office hours"). If the call is from someone I know, then it's likely they could have also messaged me or emailed me.

But if the call is from someone I don't know, it's either a scam or they're trying to sell me something. Some situation where they are more prepared than I am. But even then, text can be unambiguous in detail where I might fail to hear something in the call. And with text, I can generally take my time to reply when I choose to, can take the time to consider what to reply, etc. For better or worse, text omits a lot of "body language" aspects too.