At a high level, the Ecovacs Deebot X9 Pro Omni and the Eufy Omni E25 share a strong common foundation: both carry HEPA and allergy filtration, identical 1500 g weight, a 1-year warranty, and full compatibility with both Google Assistant and Alexa. For allergy sufferers, neither product has an edge on filtration, and the smart-home integration parity means neither locks you into a specific ecosystem.
The differences emerge in form factor and maintenance cadence. The X9 Pro Omni has a dramatically lower profile at 59.8 mm tall versus the E25's 111 mm, making it far more capable of sliding under low-clearance furniture like sofas and bed frames — a meaningful real-world advantage in most homes. Its overall robot volume (~7,420 cm³ vs ~12,559 cm³) and docking station footprint (~46,644 cm³ vs ~74,168 cm³) are also considerably more compact, which matters in tighter living spaces. Critically, the X9 Pro Omni's auto-empty system can go 150 days between bin empties — twice as long as the E25's 75 days — meaning roughly six months of hands-free operation versus about two and a half months.
The E25 does claim one tangible advantage: its audible noise level of 60 dB is notably quieter than the X9 Pro Omni's 65.7 dB. In acoustic terms, that gap is perceptible and relevant for households that run their robot during the day or in shared spaces. However, based on the specs provided, the X9 Pro Omni holds a clear overall edge in this group — its significantly slimmer body, smaller dock footprint, and substantially longer bin-empty interval make it the more practical and space-friendly choice for most users, unless low noise is a top priority.