Capacity: If you need to run devices for many hours, prioritize capacity (Watt-hours). The UGREEN unit offers a larger capacity compared to the standard Eco Flow RIVER 2.
Charging Speed: If you need the unit ready quickly, the Eco Flow's fast-charging technology is a significant advantage.
Surge Power: If you plan to run items with motors (like a small fridge or air compressor), look for units with higher surge power (often labeled as "X-Boost" or "U-Turbo" modes).