I prefer written communication because I like to think while absorbing information. As a result, when it's on a call, often I'll space out for a bit if I suddenly get a thought -- and then I'll have to ask the speaker to repeat themselves, which isn't very fun for anyone involved. Plus, I don't have the best memory when it comes to conversations.

Just the fact that written communication can be referenced (and searched!) at any point in the future makes it magnitudes better for me.

Even if a call is recorded (which it never is at my workplace), it takes a lot more time to go through a recording to find the bit you need, as compared to a quick and simple ctrl+F.

But people all work differently, so... :shrug: