ArcGIS is a de-facto standard where you're working with spatial data in most companies.
ArcGIS is everywhere, in private and government organizations. If somebody talking about GIS, it's most likely about ArcGIS. If you're experienced with ArcGIS it will be easy to learn how to use any other GIS system. The data formats like shapefiles, commonly used with ArcGIS are de-facto industry standards, that are supported by other GIS software. ArcGIS is one of the oldest systems in the market, so it sets the overall trend of how the GIS industry.
As for my personal experiences, I like ArcGIS it's easy to learn, easy to create great maps, and analyze spatial data. I think that the digitizing editor is easy to use, especially when you need to georeference the raster images, and it's better than in competing software.
You can easily automate your data transformation workflows without the need to learn the coding, using the built-in model builder. If you're willing to learn Python, you can automate even more complex workflows using the powerful built-in Python API, accessible right from the user interface. Review collected by and hosted on G2.com.