Quick verdict
Neither wattage class is automatically best. Determine material and thickness capability, duty pattern, process, electrical service, cooling, training, and ownership cost before choosing.
Key differences to verify
Compare documented capability rather than assuming every machine in a wattage class performs alike.
- Supported materials and thickness ranges
- Joint and process requirements
- Input voltage and phase
- Cooling system and duty expectations
- Wire feeder and included equipment
- Training, service, warranty, and consumables
Reasons to pause
Avoid either class when the seller cannot document required capability, shop power is incompatible, or support and safety requirements are unclear.