Do you blade edge or vertical your lawn edges with a line trimmer? Verticals are cheaper; same machine and no blades to buy but big companies I know don't allow vertical edging. Personally, I think it's not as precise as blade edging and there is no guard to protect the worker and passerby from flying debris; and you shred a lot line in the process. It also takes much longer to master verticals. I can teach you proper blade edging in ten minutes.
In the picture, the top has been blade edged (municipal zone); the bottom edge (private company zone) gets vertical treatment from a line edger. The blade clearly wins in this case.
How do YOU edge?
Vas Sladek, B.Sc., CLHT