I usually do a bit of both for a couple of reasons.
I talk lots, well, because I guess i like to talk. But I will also randomly type things, and as the night gets later, I will do more typing and less talking, as I do not want to disrupt others in the household.
The other reasons why I choose to type randomly are because sometimes regular members in my room (usually tippers), will be in places where they have no audio, and I am one to include everyone.
and secondly, there are times when I have members in my room, that LOVE my accent, but unfortunately do not speak english, so I will communicate via text AND talking, so that the english members and I can communicate as normal, and also the people that speak another language can use a translator if they so choose, and feel included in what is going on. Everybody wants to feel included, and I try to accommodate that to the best of my ability.