I don't know, I am not always comfortable with silences, not always comfortable in the presence of people in general. I am that person who spreads out awkward atmospheres in the rooms I enter. It doesn't have to be that silence is a sign of being angry or something similar, though it could be a worry, but silences are less telling, and then there is space to start to come up with possible negative things the other person might be thinking. Even if talking about things with little essence, you usually get a sense of what mood the other person is in, where they are at, you can sync up a little. So I think I usually prefer the silence to follow at least a brief chat, just a small handful of sentences can do. I am generally more comfortable with a silence if I have something to do as well, if I was eating cereal and didn't want to talk, I might read the paper while eating for example. (or I would bring the bowl to where I could eat it in solitude, and relax properly).
To me, trying to read and analyse the small signs of someone silent might be as, or usually very much more, exhausting, than chatting about not important stuff for a little while. My introversion work like that I think, I don't gather energy from being silent, but from being alone.
so to me, more comfortable if:
-small exchange of words before a silence to get a feel of where the other person is at
-being occupied with something, being inactive around someone in silence is the most likely thing to be uncomfortable to me, mind start overanalysing, don't know where to look, what to do with hands... If I have something to do silences rarely bother me much.
-having a wall between us, or a couple of kilometers