Adcenter isn't better by any means, but depending on which market/niche you are in it may be worth checking out. Doesn't hurt to try it and see if it brings you customers.
adCenter has a value for money as they are not available for publishers so all clicks will be valid.. in case of adwords as the ads are shown in publishers site (adsense sites) you will become the victim of click fraud and this wont happen in case of adCenter