I would suggest that DVD is possibly the safer option if you want a large cross section of user to be able to run it. I have recently come accross this same problem with Disc for our club. If I make to DVD most people can play them use quite cheap players. If I try VCDs then I found that my DVD player would not run them but my friends could, If I used SVCD then I could play them but my friend could not???? So DVD I think will give you the biggest coverage.