Tesla Powerwall 3 leads with 11.5 kW continuous output and 10-year warranty per Tesla specs, beating the EcoFlow Delta Pro Ultra's 7.2 kW and 5-year coverage for whole-home use. The Delta Pro Ultra excels in portability with 103 lb weight and modular expansion up to 90 kWh. Powerwall 3 wins overall for stationary reliability while Delta Pro Ultra suits mobile needs.