Watts describe a rate
A watt rating describes power. A station’s continuous output rating helps you check whether it can support a device or several devices together. A marketing boost mode or surge number is not the same as continuous output.
Watt-hours describe an amount
Watt-hours describe energy. A nominal 1,000 Wh battery powering a constant 100 W load would last ten hours in an ideal loss-free example. Real conversion losses, reserve and idle consumption reduce the estimate.
Compare like for like
Compare the same US model, battery configuration and output mode. Record the manufacturer source and date. Leave missing data unverified instead of borrowing specifications from a similar model.