Neither is better, but they have different strengths. A gas pressure washer can be moved freely as it doesn't need power source. Gas pressure washer are usually quite heavy (thanks to an engine) and loud. They also require keeping flammable fuel on hand. That said, gas washers generally have more pressure (more power) than electric washers. Electric pressure washers require less maintenance and are quieter than gas ones, but they tend to have less power. They also need to be used with extension cords and/or a generator if you are moving far from your power source. Gas models tend to start at about $200 where electric ones start at $80.