With honing steels, either edge-leading or edge-trailing can work. Most everything comes down to the right 'touch', in terms of maintaining the optimum angle and use of pressure. I use steels with an edge-leading technique at very light pressure. Too heavy with pressure or too steep with the angle tends to create some heavy, rolled burrs on honing steels. They don't abrade much (although a small bit), but instead work more to align an edge. This is seen in attempting to sharpen a really dull edge on them - it'll be a painfully slow process, if it can be done at all. So, for alignment's sake, it's more important to keep the angle right at a very light, skimming touch. Honing steels are at their best when an edge is already apexed and sharp, but just rolled a bit or just a hair away from being as sharp as it can be.