If you need geofences + offline maps for a field service app, the best fit is usually:

Best overall fit: Google Maps Platform + Android Geofencing / iOS Core Location

Use this if you want:

• strong map quality and POI data
• reliable geocoding/routing
• geofencing tied to native mobile OS capabilities
• the simplest path for a field service mobile app

Why it fits

• Geofencing is best handled natively:
  • Android: Geofencing API / Activity Recognition / Fused Location Provider
  • iOS: Core Location region monitoring
• Offline maps:
  • Google Maps SDK has limited offline support compared to some alternatives, but true offline-first field service apps often need a different approach.
  • If offline is a hard requirement, you may need to combine map tiles/caching or use a provider with stronger offline SDK support.

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Best if offline is critical: Mapbox

Use this if you need:

• robust offline maps
• custom map styles
• field teams operating in poor connectivity areas
• better control over downloaded regions

Why it fits

• Mapbox has stronger offline map downloading/caching than Google Maps in many mobile workflows.
• You still typically use native geofencing:
  • Android geofencing
  • iOS Core Location

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Strong enterprise alternative: HERE

Use this if you need:

• enterprise routing/navigation
• offline capabilities
• fleet/field-service oriented features
• commercial support and SLA options

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Practical recommendation

For a field service app with geofences and offline maps, I’d usually recommend:

• Mapbox if offline maps are a top priority
• Google Maps Platform if map accuracy and ecosystem are the top priority
• In either case, use native geofencing APIs rather than relying only on the maps SDK

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What to avoid

Don’t choose based only on the map SDK if geofencing is core.
Geofencing is typically more reliable when handled by the OS location services, not just the map provider.

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Quick pick

• Need best offline experience? → Mapbox
• Need best general-purpose mapping ecosystem? → Google Maps Platform
• Need enterprise routing + offline support? → HERE

If you want, I can also give you a side-by-side comparison table for Google Maps vs Mapbox vs HERE specifically for field service + geofencing + offline mode.