Oh no...not again... (steve...ignore my response

Just Kidding

)
I've tried both...and generally agree with the comments.
Spark Quality:
Probably no difference at all, except that DS2 allows you to run larger wires (I'm currently running 8mm)
Aftermarket hook ups:
MSD has wiring diagrams for both DS2 and Pertronix. Both are pretty easy to wire, though pertronix is actually a little more complicated. I did not notice any real gain either way.
Stock look:
Pertronix. That's if looking stock concerns you.
Simplicity of install:
Pertronix
Cost:
DS2 is a little more expensive, depending on your parts choices.
So...why did I switch from Pertronix to DS2? Simple, Al gave me a DS2 dizzy. Also, if you accidently leave your ignition in the run position and the car is not running (especially if you are doing some minor work) then you can fry your pertronix. I also had pertronix fail me once. It happened withint 2 weeks on install. This is before I realized I should have left the points in the truck of the car. 3 of the magnets fell out with the tape peeled off. I ran the car home on 3 cylinders firing. Very interesting trip. I continued to run pertronix for another year with abosolutely no problems. I also wanted something more over the counter. Every Autozone I've been too has a DS2 in stock so worse case scenario, I should be able to track one down if something goes wrong.
To your wire question. I don't believe pertronix with a hotter coil will eat up wires much quicker then normal. You should be able to find 7mm sets for the old style cap. I did find that my cap wore out a lot faster. I had to replace it after about 6000 miles (about one years worth of driving for me in my mustang). The only thing the Pertronix replaced is the points and condensor. The rotor and cap are still used from your original set up.
Basically, if all you want to do is get rid of the points, and make your car run smoother, go with pertronix and a post 68 dizzy as mentioned before. Real easy to install. Reliable. Simple. Vastly improves the performance of the car (and driveability). Also, if you are concerned with stock look (since you talked about shows) Pertronix is the way to go.
I really had no complaints about my pertronix. I just wanted to be able to use something more stock.
Slade