Wigwam lite hikers (merino) or smartwool PhD merino's for me.

if I'm with a boot I use a liner. I tend not to in trail runners.

I flit back and forth depending on what I am doing. On "established" trails I wear a trailrunner - ususally some variant of Montrail, which still seem to work for me.

on more off-route stuff - Hanwag boot.