google adword always because all about internet is on google hand so i give first priority to google.
There is no comparison between google adsense and yahoo/bing network. Both are close competitors but adsense is way better than them in every respect.
Would choose Google AdWords as well. But will also agree with the colleague that if you have enough time and budget, you can work on both, this will only increase your marketing efficiency.
i think google adword most good fro using various pupose for marketing. Aslo have many opyion like creating ads and making keywords list for the sites.