Manifold Vacuum Advance what am I not getting?

I've always thought that on a street car ported vacuum is the best way to go since most driving is at lower speeds. For a street brawler or race engine manifold advance should be used. I understand cam and compression come into play when choosing.

I also think that if the carburetor is not properly tuned you'll struggle with idle timing.

Anyways here is a video that covers quite a bit of options for you guys to critique.