I guess they have to have good climbing (moves but also some length to the pitch), incredible position/scenery, and ? intimidation?
#1 How about pitch 2 of Reed's (5.9) in Yosemite? Are those not the most skeleton grabbing jams anywhere? And it looks kind of mean for 5.9 from below
the last pitch of zebra zion at Smith is a kick in the pants,
Split pillar, position and climbing, damn
Mosquito is mighty fine,
Illusion Dweller 10b, Sail Away 8, Double Cross 7, in Joshua tree
Godzilla is the Business for moderate at Index, Breakfast of Champions?
Givlers in Leavenworth,
Don't know Leavenworth too well but midway (direct?) has sweet easy hand crack up high, traversing up and right, for the grade the position and scenery, fun fun
MF overhang- not pure crack but technical, and yeehaw