Close call. D1 and HD-1500 trade wins across the matrix.
Readiness, uptime, navigation & connectivity
Price accessibility and ROI clarity
Payload, speed, runtime & labor replacement
Environment fit, footprint & long-term upside
Multi-floor security patrols in facilities with stairs, slopes, and cluttered outdoor perimeters (warehouses, construction sites, utility substations)
Pallet-sized load transport in high-volume manufacturing plants (automotive, food, beverage)
Both are credible picks. Decide on cost and supplier proximity, not capability — the gap is small.