German short rows here. In fact, I've just finished working short rows German style on a collar. I had done wrap and turn short rows, couldn't get them to look good, got a link here at KH for German short rows and haven't done any other type since. I watched the Japanese short rows video and decided that for me, if it ain't broke don't fix it.
I think German short rows are the easiest, but not sure if I am getting them closed enough.
When I turn, I pull the working yarn pretty hard (one reference I came across said to yank it) so that the stitch is really pulled around the needle and then hold that stitch with my finger as I work the next several stitches tight so as to avoid extra yarn or a loose stitch. When I come back to pick it up I make sure I am getting the right needle through both strands of yarn on the turned stitch, dropping the extra leaves a gap or hole. Usually I try to be pretty loose and easy with my knitting, these turn stitches are an exception. HTH