Hope that I will be able to explain , this is little test that I did to change my stitching, so there are 8 lines but only 4 stitching patterns that I did, (difference is top 4 rows holes are in this direction /////, and bottom 4 are opposite) .
1-face needle first then back needle goes under plus loop on face side.
2-face ,back under, no loop
3-face, back above, plus loop
4-face, back above, no loop
So ,for me number 3 looks best, (no matter what direction holes are) stitching looks identical on both sides, before I was doing number 1( face would look great but I was not happy with back)
Hope that you understand me, and that this helps.