DADGAD is fun and pretty and all, but if I'm playing n a session, and need to be able to change keys all the time, I find standard tuning is a lot more flexible, for me.

Also if there's someone there who isn't too sure about things, it's a lot easier for them to follow what you are doing. (When they've got it, I would probably capo up few frets and play appropriate chords, because I think it gets too crowded if there's more than one guitaer playing in the same range.)