HP
ArcGIS Online offers Free Trial, but eSpatial does not.
eSpatial is designed for Large Enterprises, Medium Business and Small Business.
ArcGIS Online is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of eSpatial begins at $1,295/Year, while pricing details for ArcGIS Online are unavailable.
Some top alternatives to eSpatial includes ArcGIS Online, Mapbox, Maptive, Maptitude, Map Business Online, Mango, vMAP, Agile GIS and Mapify.
Some top alternatives to ArcGIS Online includes CARTO, eSpatial, Maptitude, vMAP, Esri ArcGIS, 21stCenturyGIS, 3-GIS, Agile GIS and Geoconcept GIS.