Laser is less effective than electrolysis because it targets the pigment of the hair that is only found in the Bulb, not the Bulge where the growth cells are. The damage to the hair is considerable enough that it will slow the growth cycle for a couple of months before reappearing.The other advantage of electrolysis is that it is suitable for pretty much all skin tones and hair colours, unlike laser hair removal.
Laser first? The simple rule is: Do laser first if you have dark hair and light skin. If you have dark skin or light hair, skip laser and do electrolysis from the start.