My organization builds applications mainly using Python and the ArcGIS API is very easy to use and integrate with different programs using Python. The features that they provide such as using APIs for cross-platform and provide about 1,000,000 basemap and geocode transactions per month for free is great for start-ups. Review collected by and hosted on G2.com.
There is a different Commercial Deployment version also for ArcGIS API for Python which includes all the features in the free version and additionally just gives deployment of unlimited revenue-generating apps and ESRI technical support. I believe that for the commercial version they can provide some more benefits to the user too so it can become satisfactory. Review collected by and hosted on G2.com.