Most technically and mentally demanding, AND most enjoyable - Dru North Couloir Direct with Ginge Mcgrath. Mind blowingly steep, interesting and fun climbing!
Most physically and mentally taxing - Eiger 1938 route. Hardest I've pushed my physical limits. The bivi was surprisingly nice.
Most fun, low stress on a big face - Brandler Hasse with Andy. So good we came back nd did ISO2000 next to it for more of the same.