Constant or Ported Vacuum Source for Distributors? ...AGAIN!

Always a great debate ..... ported guys always seem to swear manifold vacuum advance will cause poor off idle performance yet I don't experience any of that in both my cars, both smooth as can be ... one 383 auto and the other 340 4spd ..... both mild cams .... I wish I had a ported only dude living near me to sway me to their side ! I'm open and willing to learn new things !