chossiest crag ever: vantage. don't mind occasional loose holds but when they are unpredictably loose, whole bolts come off with the rocks, and the entire column is unstable i do not like it.
chossiest rock climb: some pitches of cayoosh wall were quite bad, rotten schist. i was very worried the ropes would be cut just from their movement as they followed me up the climb
chossiest "rock": volcanic debris on the north side of plinth peak. but hey when you can cut a bollard in rock with your gloved hand you can just pretend it is a solid type of snow. however when chunks of snow hit the belayer they usually don't result in cracked helmets and broken cameras.