Which one runs a space heater or window AC?

The SeeDevil, on paper. It is rated 2000W continuous with a 4000W peak, while the DELTA 2 is 1800W continuous and 2700W surge. A 1500W heater will drain the SeeDevil's 2131Wh in roughly 1.4 hours and the DELTA 2's 1024Wh in under an hour.

The DELTA 2. Its LiFePO4 cells are rated to 3000 cycles to 80% capacity. SeeDevil does not publish a cycle rating for its lithium-ion pack.

Is the DELTA 2 worth the extra money?

If you plan to use it often, yes. Longer cell life, app control, and 10 fewer pounds matter over years of use. If you mainly need maximum stored energy for emergencies, the SeeDevil's larger battery may win on price per Wh.

Can I charge either one from solar?

Both support solar. The SeeDevil takes DC 12-24V at 8A max, about 200W. The DELTA 2 ships with a 220W bifacial panel and accepts more solar input.

Which is easier to move around?

The DELTA 2 at about 27 lbs. The SeeDevil weighs 37 lbs, so plan on two hands or a cart for either.

Do either have an app?

Only the DELTA 2. It connects to the EcoFlow app for remote control and monitoring. The SeeDevil has an LCD and status lights but no connectivity.

SeeDevil 2000W Portable Power Station vs EcoFlow DELTA 2 Portable Power Station

The EcoFlow DELTA 2 is the better buy for most people: it has app control, X-Boost to run appliances up to 2200W, LiFePO4 cells rated to 3000 cycles, and it weighs about 27 lbs against the SeeDevil's 37 lbs. The SeeDevil 2000W counters with a larger 2131Wh battery and a higher 2000W continuous AC rating. Prices were not given for either unit, so compare live store prices on this page before deciding.

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