Go with the Miller 200 Dynasty DX which has the pulsing option. Unless the other brands have changed, Miller allows the full welding amperage output with full AC weld output with full pulse capability. The others limit the machine to full output with limited pulsing or full pulsing with limited output. Try them both at your distributor, before purchase. A good test is worth more than a thousand opinions. The fan on demand is a great feature, especially at low amperages.