As mentioned above, NAV has the reputation of being a good solution for SMEs and AX is a good fit for enterprise companies. However, size doesn’t necessarily have to mean the number of employees or the number of offices around the world.
While it is true that NAV is easier to use and deploy if you need an on-premise solution for a single office, what you also need to factor in is how complex is your business and data structure. NAV can handle many of the requirements for enterprise companies that have multi-country and multi-currency requirements if they have a simpler architecture. But, if you have multiple entities, multifaceted workflows, or complex data architecture, AX may be a better fit.
AX had a reputation of being the best fit ERP for manufacturing firms. That is because manufacturing companies have complex processes and multiple components to the process. But, you don’t have to be a manufacturing firm to use the AX solution. The system can be useful for professional services firms too if you have a complex architecture with different business focus, more than one business entity, etc.