The notable missing features are the synchronization tools, beyond that I haven't found anything of import missing. The data modeling tools in IntelliJ/DataGrip aren't anything to write home about, but I rarely use them (I've always just busted out Visio or LucidChart for UML/relational modeling when I have to do it).

For my own work use I really have no choice but DataGrip, it's the only database utility that supports DB2 for i, Microsoft SQL Server and PostgreSQL - all of which we use heavily at work. But also being a heavy user of other JetBrains products (IntelliJ, ReSharper, PyCharm) having a familiar interface is a huge positive over Navicat since all of my keyboard shortcuts work the same and I only have two different (VS vs IntelliJ-based IDE) ways I have to remember how to do code snippets instead of three.