I do both, but there are times when I would love to be able to do certain activities without having to go into a fireteam. I don't mind the LFGs since I usually end up posting my own specifications for what I'm looking for, and get a good group from it. But there are some days when I want to do certain activities (i.e. a raid) but really don't feel like talking or hearing people. So those days usually end up with me playing something else.