Bob, when I did my aerial rescue cert we had to show the ability to both tie and then climb and rescue another using the rope harness, have to say I admire all those who sacrificed their comfort in the struggle to develop the great harnesses we use today, after the prac in rope harness I was walking like brother colin
EMR, I climb on a VT and a simpler version french prusik that can be tied one handed. Like Ekka when I have to spike up a vertical pole I'll use a blakes or English prusik, mainly because it seems to be easier to advance with the rhythm of body thrusting. I also like to play around with my options when double crotching with whatever hitch is on my mind..really like both the icicle and schwabisch.
Sean