MSD - my spark disappeared.
Save your money, get the Autronic or the M&W. I have installed a few of each and have had success with both. You need something where you can map your dwell time vs rpm so you can drop the energy of the spark at high rpm which drops the power required from the box and increases its life (not that I have a seen an Autronic or M&W come to the end of its life).
CDI will put more energy in your spark, but its over a shorter time length compared to an inductive system. I have seen small increases when nothing else has changed, going from inductive to CDI ignition. I can see the advantages on a high reving big block or high bosst engine to go CDI, but I am not too sure about a stock engine yet I have seen changes. Many variables there are.