There are two types of applications: one where you know your data model from the beginning and one where you don't. Static types work exceptionally well when you're modeling something you understand pretty well; especially to the point where it is not expected to change significantly. On the other hand, a lot of programs find their data model while being made. This is fine too, what is expected from a program can change, sometimes a lot. I've built both types of applications in both types static and dynamically typed languages.

What your team knows matters more than either of these.