I selected "sliding", because my first stringer is a cup or pocket on one end, and an inch and a half wide leather strap on the other end. It's long enough that I can slide it out nearly to the nock before I start pulling, because the uneven pressure prospect worried me.
What I use the most is a long string, served on both ends, with double nocks on the limb tips. My sense of balance makes me uncomfortable with the step through method, though I still do it, now and then.
Frode