I use Google adwords but I think it will depend on niche/keywords and the competition on different domains for individuals.

I am curious as well if you have marketed using Youtube PPC. Post any feedback on the topic as i would like to know more about that as well.

Google Adwords if you want traffic, yahoo and msn are generally cheaper but less traffic,just be careful and place daily budgets to keep the spending in check

Yahoo is more user friendly than Google in my opinion. The way you set up you ads, quality score & admin area are simpler to someone that is not a pro. Just like a mac vs a pc. My ROI is 28% better on Yahoo running the exact same ads and keywords but then again this is just my opinion.

My tracking and Adcenter have shown that Adcenter traffic converts 65% better than Adwords. Not to mention you can get clicks cheaper since their are fewer bidders.

google would be most recommendable as majority uses it and same do i......

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Google definitely. My boss is using Microsoft, Yahoo, and Google at the moment and I noticed that their campaigns produced the most desirable result.

I prefer Google, since the traffic volume is way too low with Yahoo or MSN

Here is the correct answer:

Use them ALL - track every source - and if they make a profit keep on running them.

Simple!

Also don't discount some other smaller engines. There are 6 or 7 quite good ones that, although small in volume, can prove profitable if you just spend a day setting them up after you've got your campaign profitable on the Big 3.

Hope this helps!

Kenneth

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Always Google.