Shapeoko Pro spindle vs router noise comparison!! (Very unscientific!!)

I talk to a lot of people about the HDZ and 2.2kw spindle upgrade for the Shapeoko Pro.
This would of course be relevant no matter what cnc you were adding a spindle to.
It seems to be almost mandatory for people to add a enclosure to their hobby level cnc router builds. People either incorporate a enclosure to their base from the beginning or add one very soon after building their cnc. In my opinion they do this primarily due to noise. No one wants to listen to a screaming trim router for several hours......
The answer in my opinion is spindle. Will it reduce the noise as well as a enclosure??
That depends on the enclosure. A enclosure built with 1/2" or 3/4" plywood or M+DF w+ill not³ reduce as much as you might think. A doublqe walled enclosure with sound deadening insulation will probably make your cnc sound very quiet but your looking at doubling the cost of the build.
I hope to very soon shoot some video showing a decimal meter during a actual carve.
If you read through this or just skimmed to bottom and are interested in a spindle. Find me on Facebook and I can show you two options that will fill the needs of most everyone.