Well, you have a perfect ESC to do both.
The internal governor (use Heli Governor Store) is simply set and forget.
Works really well, no tuning and no extra wiring to the Spirit is needed.
For the Spirit governor you need to connect the yellow ESC wire to the PIT port on the Spirit unit.
Then you open the Spirit Settings software and set some parameters. (See manual).
Finally some tuning is needed to make it work. (Do tweak "Governor Response" and "Holding Performance".)
Make sure you read this:
http://manual.spirit-system.com/index.p ... RPM_outputhttp://manual.spirit-system.com/index.p ... n#GOVERNORI did both and currently use the internal Hobbywing governor.
However lots of users use the Spirit gov. with great success.
Try both and let us know how you end up!