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build vs install

What are the downsides to getting the source code and doing the
build/install myself vs. using a pre-built package other than I'm
responsible for noticing the software needs to be updated?

The latest example is ttcp
  http://nuttcp.net/nuttcp/latest/  has 8.1.4
  https://tracker.debian.org/pkg/nuttcp  has 6.1.2-4

If I ever decide to go with the debian package I just uninstall the
software I built and .. anything else that needs to be done before
installing an official package?